Almost on a whim, I checked for updates on my 5800 yesterday, turns out Nokia continues to be very generous (and partial) to its first ever phone on the v5 platform. The latest update gets the version up to 52.
The partiality of course comes from the fact that not all Product codes, even though they are otherwise identical, seem to get the love. If I had not changed my product code, I would probably still be stuck in the v30s myself.
A changelog from Nokia, as usual, is missing. However, it does feel quick and responsive to the touch and during rotation. Cannot confirm the other unofficial claims of better photos and video - they pretty much feel the same.
The question of course is this - how long will this last? Is Nokia 5800 the Nexus One of Symbian v5? Or is this just the test bed that gets updates more often because Nokia needs feedback on them in the wild before they get professionally rolled up into its ^3 devices? And, does it even matter?