The update has made Galaxy S a lot snappier and includes various bug fixes. We will soon be posting the final changelog of the update. Till then try updating your phone via Samsung Kies and let us know in comments if you got the update.
A few twitter users are also reporting getting the update.
Via Swedroid

3 replies on “Galaxy S Android 2.2.1 update rolling out now in some regions”
I have got it in Iceland
I had updated in India quite a few days back. But used the KIES registry hack. Performance is definitely lot more snappier. Quite a few UI glitches solved too (some alphabets in phone book were missing). Exchange support and performance has a big improvement.
for those interested to get it early can view a quick guide at http://abhishekdev.posterous.com/39839249
Not yet officially available in India…. 🙁