A couple of things...
1. You have to update to 2.1 via the Sony PC Companion software correct? So it recognizes what country/carrier you're with and if the 2.1 package for that region has been prepared it will allow you to update?
2. is it just me or was there mention before of the 2.1 update for the Xperia on Rogers slated for Q1 2011? becuase it was going to take time for them to "Rogersify" it...
Cheers,
rp.