World Of Warcraft: No New Races at E3...

As seen in this post, GFraizer told us that no more races will be revealed at this years E3. He did say this, however.

"That is all the races they are revealing for now. There is no word on when the next race will be revealed but it probably won't be for sometime (but before the beta)."

So don't worry, eventually, more races will be revealed, just not any time soon. Night Elves were just revealed less than a week ago, so I think most people are happy enough.