The angular 2 beta is already in production use within Google, so I don't think it's going to change that much for the final release. It's also quite different than 1.x, so unless you are going to want to work on migrating or maintaining 1.x projects learning 1.x isn't going to help you that much.

I'm not sure how good the v2 docs are right now (haven't dived into them much yet), but I'd say you are probably best off to start learning v2 now and get a head start - Egghead.io has Angular 2 tutorials up already so you could try those. Angular 2 is looking really good, and seems to be a big improvement in performance and simplicity over the first version, so I'd recommend learning it.