I'm looking forward to pandas and monks. Monks because they're another hybrid leather class (I think) like druids and pandas because it isn't humanly possible to hate a panda. They're fuzzy and cute and sometimes get scared by tiny panda's sneezes. I'm pretty sure there is a ton of "hate" on something in every wow expansion, but once the expansion hits everyone forgets about it and keeps playing (or quits but even then, wow still has a huge subscriber base).
I started playing at the beginning of cata, maybe a month or two prior to 4.1. I still play WoW and am very much looking forward to what MoP has to offer. Really liking the new skills as shown on the talent trees, esp. the new druid ones (as my main is a druid). That being said, I'm not looking forward to wow becoming a "Pvp oriented" game, as many people have suggested it will become. I don't pvp at all (mostly because I suck at it) and pve is just more fun for me.