I doubt they would pull a lightforged undead for the Alliance, that would give another shitty half assed attempt to them and they gotta realize by now that 90% of the stuff this expansion looks like Horde favoritism even if it all boils down to them having started with the Horde stuff and then having to shit out a bunch of horses and crap because they were running out of time.
I hope they go the Junker gnome route for the undead allied race and just give the Horde non boney undead, undead elves, or some other customizations and then worgen get the goblin treatment and they make something good and not recognizable as the base race.