Just feeling like playing wow recently. Has the game changed much? (quitted around 2010?)

Last time I had wotlk but now that i checked I suddenly have cataclysm and mist of panda thing (starter edition)? I guess I have used the free 7 day things before. I really got my acc updated that easily or do I have to buy those expansions? couldnt find them anywhere on b.net.

Are hunters/warriors any good these days? Last thing I remember was quitting since some huge patch pretty much made hunter unplayable. Both are around lvl 80.

Never even got to see that lich king. :[ is there an easy way to get his quest started? oh and if I buy wod do I get a month free playtime?

also other tips are more than welcome.