You know me, I love starting things up about a "second batch" only because its a collectors worst nightmare -- a better version offered on the same figure they just bought. But I don't actually subscribe to the myth. The Han 'difference' is so minute -- variance likely due to factory paint refills and application variance by 'change in line' or something. I think I see the slight difference in lighter hair on the left (more yellow in it) or redder skin tone on the right, but the 'determined expression' I really don't see.
That all said, I will continue to torture people with the "v2 is better" strategy.