I first got this phone in January and it came with Android 2.1 (eclair) though Docomo were promising and update to 2.2 "sometime in Spring".
My wife went into a docomo shop the other day about an issue she was having, they suggested they try upgrading to 2.2 to see if that helped. It did, then she came home and got me so I could get mine updated too - good girl.
Now I'd asked their staff a number of times when the update was coming, they said there would be an email sent out and I would have to download something on my computer (not an over-the-air update for some reason?) and to keep an eye on their website.
I never received any email and the English version of the Docomo website still doesn't have any news of the update.
What I'm saying is that if you want the update, just go into a Docomo shop and ask for it. I don't know when they'll get around to letting you know otherwise.
If you don't already know, the update to 2.2 is a pretty big improvement. You get Flash (can watch videos etc in your internet browser), move apps to the SD card (in case you're running out of space), some security holes have been fixed, the graphics seem to have been improved and there are a number of glitches that seem to have been fixed (video camera, audio, the whole thing seems to run better).
So it's well worth getting.
The thing is, this 'new' version is still well over a year old, there have been two more improved versions release by Google since (2.3 and 3.1), who knows if Docomo will every get around to giving us those updates?