Blizzard have released a short video revealing that, as speculated, the next expansion will be Journey to Un'goro. Four cards from the next set were shown in the reveal video.
The expansion will be released in early April, and will contain 135 cards. It is set in Un'Goro, an area filled with dinosaurs, with a volcano at the heart of the region. The launch of the set will trigger the start of The Year of the Mammoth.
Volcano, adding to the flavour of the set, was the first card to be revealed. It is similar to Elemental Destruction, but not as reliable. While on the subject of Elementals, the word Elemental is going to be used as a tribal name. Many cards will be tagged as Elemental, which presumably will allow for cards that interact with them to be printed, along the same lines as Beast has currently.
The image above only tells half of the story. After Pyros dies as a 6/6, it returns back to hand yet again as a 10/10 that costs 10! This mechanic might imply that there is a focus on value as opposed to tempo, although of course one card is a meaningless sample size! There could also be a Quest to play a certain number of Elemental cards in a game, although it seems unlikely that it would be a Mage Quest.
Adapt is a new keyword, along the lines of discover. There are ten different powers to choose from. Taunt, Windfury, Divine Shield, Cannot be targeted, +3 Attack, Deathrattle: Summon two 1/1 Plants are the six shown in the video. We've also been warned that plants are not just plants, so we can only speculate on what a 1/1 Plant might do.
One of the more interesting features of the new expansion is the Quest mechanic. Quests start in your opening hand and have a big reward for completion. It is displayed in the same place as Secrets, however both players can see the Quest, and how close it is to being completed.
More reveals will be made on March 17th. Until then, we will just have to speculate as to what else lies in Un'Goro.