Patch 6.2 adds Naval missions to your garrison. You can't have Naval missions without ships, so there is also a new Shipyard being added to your garrison. The Shipyard is not a building and doesn't take up any existing slots or space in the garrison.
Both the Alliance and Horde shipyards are placed near your initial arrival point to the zone. The Alliance can get to the shipyard by taking the new exit that was added to their garrison. The Horde can take the existing back exit down to where the crashed ship was to get to their shipyard.
The Shipyard is unlocked by completing a short quest chain at the Iron Docks, accessible to anyone with a Level 3 Garrison. Vol'jin/Varian send you to the Iron Docks to recruit a Shipwright. You collect supplies and break Roark out of a prison train. After Roark is free, you reclaim his blueprints and return to your garrison to construct a shipyard. Currently it costs 5,000 garrison resource, but that is a placeholder value.
After unlocking your shipyard, you meet Solog at the dry docks and build a Transport ship. Currently the ship costs 1,000 resources to build, but this may be another placeholder value. Once you have a ship, the Assault on Tanaan Jungle can begin!

You may remember Timewalker dungeons from when they first appeared in Patch 5.4. They are finally here as a weekend event that reward scaled up versions of old items!
As we get started testing Patch 6.2 on our public test realms, we're looking forward to discussing all of the new features and content coming to World of Warcraft. First up, we're excited to present Timewalking.
In Patch 6.2, we're introducing seven different weekend events that will run from noon Friday through noon Monday every week. Two of those events will be Timewalking weekends, in which you'll be able to queue up for a randomly selected old-school dungeon with a new sort of "heroic" difficulty: When you Timewalk these dungeons, you'll find that your character's power and gear has been scaled down to a fraction of what they normally are. For the first time in years, some dungeons you outgrew long ago will once more put your skills to the test.
A good challenge deserves a good reward, so to go along with scaling you down, we're going through most every piece of loot in each Timewalker dungeon and scaling it up. That's right, when you Timewalk through Utgarde Pinnacle, take down King Ymiron, and loot his Red Sword of Courage, it will scale up to an item level appropriate for use at your level.
Timewalking will be available to characters who are level 71 and higher for Burning Crusade content, and level 81 and up for Wrath of the Lich King dungeons. It will open up only during certain three-day-long weekend holidays. While Timewalking, your power will be adjusted down to the level of the Heroic dungeon, but you'll retain all of your skills and talents. We will also be testing additional rewards, such as a level 100 quest that rewards one Seal of Tempered Fate per weekend, so keep an eye on the in-game calendar.

Blizzard's ninth epic gaming convention and community celebration is returning to the Anaheim Convention Center on Friday, November 6 and Saturday, November 7, 2015. Form a party with your fellow members of the Blizzard community and get ready for two days of in-depth discussion panels with our developers, hands-on play time with the latest Blizzard games, and intense eSports tournaments featuring top pro gamers from around the world.
If you can't make it to the show in person, you'll be able to watch from home with the BlizzCon Virtual Ticket, offering comprehensive live coverage of the event via a multichannel Internet stream.

New Features
New Blood Elf Models - The updated models are finally here.
New Character Model Tweaks - The Night Elf male run animation was finally changed.
Heirloom Tab - The Heirloom tab is finally here.
Heirloom Item Changes and Upgrades - Item upgrades are back for Heirlooms.
New Neck Heirlooms - The new neck slot heirlooms provide a heal on a 2 minute cooldown.
Heirloom Achievements and Mount - A new 60% mount usable from Level 1 and some achievements are part of the heirlooms update.
Heirloom Prices - Heirloom prices have been adjusted and some new heirlooms added.
Twitter Integration - Link a Twitter account and tweet selfies.
S.E.L.F.I.E - The most useful garrison mission reward: A selfie camera that can be upgraded to add filters.
Follower Changes - Harrison Jones, a new legendary follower.
Mission Changes - Profession missions, Archaeology missions, BRF missions, and Relic Hunter missions are just some of the new missions added.
Garrison Resource Changes - Scavenger was nerfed, new items added to the vendor, and a new source of garrison resources were added.
Work Order / Building Changes - Faster work order completion, more useful buildings, and other quality of life changes.
Garrison UI Changes - The default UI has a few basic Master Plan features now.
Garrison Jukebox - The ability to change your garrison's music and another collection minigame all in one.
New Apexis Gear - If you have the crystals, the vendors have some item level 670 armor for you!
Profession Changes - Stage 4 crafted items, crafting spells that bypass the daily cooldown, and a Savage Blood transmute are a few of the changes.
Graphical Updates - Better SSAO, MSAA is back, SSAA has been added, and nicer lighting.
New Loading Screens - Garrisons finally get their own loading screens.
Veteran Accounts - Your characters under level 20 can log in and join your guild even without an active subscription.
New Toys - Along with the new toys, several items were flagged as toys so that they can be added to the Toy Box.
Colorblind Support - Differentiating colors should be a little easier for those with colorblindness now.

Patch 6.1 features:
Tradable game time tokens that you can sell to other players for gold.
A legendary follower is coming to the legendary quest line.
Better flight path routing.
The long awaited heirloom tab.
Blood Elf models and other new character model fixes.
Blackrock Foundry in February.
The ability to send tweets from in game.