Google desperately wants browser marketshare. My guess is that by taking it out of beta and announcing an official version 1.x as stable, they'll be able to finalize few distribution deals with PC OEMs. OEMs don't like shipping beta stuff (even though some stuff they ship is worse than most betas you'd try from MS or Google) so this will pacify them. In short, this is just a marketing move on their part... don't read much into tech side of things at all.