Some parts of the "leak" that are correct -- 10.0 is dragon isles, the cap is 70, and tyrande has to make a hard choice regarding sylvanas, but not with what is described here. Her choice involves a new world tree. Cross-faction play is planned. Other things they mention are completely wrong.
- there is no tinker class, and there is not one being planned for any expansions being worked on
- there is no old-world revamp
- there is a new class, and it's dragon-related (last i heard was two DPS specs and a healer, no tank)
- there is a new race, and again it is dragon-related
- the expansion also has to do with tyr, tirisfal, and ulduar
- player housing is coming, but not until 11.0 or later
- ive been informed that while 10.0 is going to be really cool, 11.0 will "make me crap my pants" as far as the concept goes
edit: forgot this tidbit
- new heirloom gear sets for remaining races are being worked on
- humans look very stormwindy (surprise)
- night elves look similar to the OG cinematic night elf armor
- draenei look like their rugged BC concept art
Fingers crossed I'm not being played