For some reason, people seem to think that C3 is coming out in a couple of months. In my interview with Ashley, I asked him "2015? 2016?" and he couldn't even tell. So let's not get ahead of ourselves, it's not going to be here for a while.
By the time it comes out, if you buy C2 now, you'll have time to get a good grasp on how games are made (with C2 and in general) and it will only benefit your potential C3 experience.