remember reading several months ago (6 -12 months somewhere in there) that blizzard was planning on releasing one new hero class per expansion and that an arch druid was in the works. So from that it was assumed that the Emerald Dream would be the expansion after Wrath, but as that was a long time ago Blizzard may have changed that idea totally I have not heard anymore about it since then. http://bit.ly/he9sRz

But there is a certain amount of 'loop holes' for even the best lore nerds when you concider the Death Knights. Their starter area is allready devistated right NOW. Yet we won't be playing them or seeing them til expansion.
http://bit.ly/ifzDYG

Yup the whole disturbance in time in flux what have you can explain so much BS you just kinda gotta start shaking your head and go with the flow.
When the expansion comes out time is finally on proper course and Death Knights will emerge as if they been with us since right before the Start of the Burning Crusades.

http://bit.ly/emRJL4

The spacegoats prob landed or some could have crash landed in Northrend by accident I mean too many explainations possible when time itself is involved and in trouble.

http://bit.ly/eFXuRR

If the world dragons have become corrupted by the Nightmare there is little doubt that Malfurion would also, at the very least, be susceptible to corruption
http://bit.ly/hUrjoe