There's still a small amount of language evolution going on. We recently added mixins, for example, and there's a couple of minor things still being batted around.

However, we are making very few breaking language changes right now. Most of the fast-paced evolution is in the core library. Unfortunately, the corelib was essentially stagnant for close to a year, so now that people are working on it, they are feverishly playing catch-up to get it to a good place before 1.0.