Well, how about that. As soon as we post our review of the Sony Ericsson Xperia X1a, a new ROM update makes its way onto the Internets.
The folks at XDA Developers are still deciphering exactly what's been updated, though Opera and WiFi connections are being mentioned. As far as the dirty details, you're looking for ROM version 1.03.936.6, labeled R2A. It also looks like there are a bunch of language options, and those of us in the U.S. should be looking for X1a GENERIC NAM CDF1219-1224 KOV_R2AA008.rar.
This appears to be the read deal, even if SE's update system is saying otherwise. As always, read through the thread before you try updating anything. And above all, back up your data first!