For N8x0 users: you may need the Opera catalog enabled to see the update.

Web address: http://deb.opera.com/maemo
Components: non-free

The updated version appeared in my Application Manager this morning. I also have Extras-Devel enabled. If you don't see the update, those might help.

EDIT: Looking at the opera directory, it looks like I'm wrong about the Opera Catalog. It must be in Extras-Devel.