I, myself would like some new classes (although most sections have been covered by the original classes). New races would be nice although I can't think of any additions to the Alliance or Horde, which wouldn't need a very good explanation. Another idea would be the whole Blood Elf\Naga\Fel Orc\Dranai faction, which i think would work (Blood Elf - WARRIOR, MAGE, PRIEST, WARLOCK, HUNTER. Naga - WARRIOR, MAGE, WARLOCK, HUNTER, ROUGE. Dranai - WARRIOR, HUNTER, DRUID, ROUGE. Fel Orc - WARLOCK, WARRIOR, HUNTER, ROUGE. Flying Mounts - COUTAL, DRAGONHAWK. Ground Mounts - SNAP DRAGON (Naga), ???? (Blood), ???? (Dranai), FEL WOLF (Fel Orcs).)
My opinion on the expansion is that unless it gets popular then they will release an expansion. The problem to releasing an expansion however is that Everquest 2 will be released after WoW, and certainly Everquest 2 will probably be popular attracting more MMORPG people. Likewise, it's just my opinion.
Those races are not likely to exist as playable races. They're either in-game already, or not even on the same planet(Draenei). Most races would have a hard time finding a starting location as well. Friend has beta so don't complain about how you don't believe me.
I would love it if Illidan's followers were added! Btw evilwart-dragon BElves could ride horses and Dranei could ride those lizard things they used in that one mission where you had to close the portals.