There is nothing saying the 930 will be 32nm. It is more likely that it will simply be a C2 stepping, maybe C3, of the 45nm chip we've all known and loved.
You're fine with your 920. I just got mine 2 weeks ago, and it overclocks to 4.2Ghz with only 1.275V core voltage. I don't believe the 930 will overclock any better.