warcraft

I played World of Warcraft for maybe two years, think it was in 2011 and 2012, and had a lot of fun playing, but stopped due to my studies and not having enough time to play. I'm actually thinking about playing again, so my question is, what changed since 2012? Gameplay changes, new races, etc.

Have anyone noticed there are a lot of botters in warcraft? It has become a nuisance in the past few days. Mostly I see them near some water, killing sirens just when they spawn. The same person does this for days in one stretch and keep spamming the same skill on and on. Reported them and still...