Sargeras returns from his holiday in the Twisting Nether and stomps the fuck out of Azeroth.
Then in Warcraft 4 (the RTS), we get to collect what little people we have left and start rebuilding all over again, lead by Rhonin the biggest goddamn Marty Stu to ever be written into literature.
KNAAAAAAAK!
All players will simultaneously recieve the same message "GET A LIFE" along with a nice tally of how many hours they played and get special ranks depending on how long they played going from Loser to Nerd all the way until the coveted Virgin 4 life.
That's clever, did you make that up all by yourself or did you need mommy's help?