When WoTLK news was leaked there was already a beta out for it and the DK info had models of them. This has squat.
The only thing we know is true from this "News Article" is that blizzard bought "Cataclysm".
If anything is going to be a new race it's not going to be anything already in the game. And if it is (blood elves) it will fit the lore that blizzard has already made for them.
The only blood elves in Pre-BC were in azshara and the game never said what they were there for. Then comes BC and we get a whole new race with lore, a city and new models.
Goblins AND Worgens already have their lore told in WoW. Plus ALL goblins are part of the steamwheel cardel a neutral trading company. Worgens aren't even humanoid.
All new playable races will be humanoid.