There are a bunch of random threads in the Google Webmaster Help Forums as well as two WebmasterWorld discussion ranking changes.
The ranking changes may be specific to a subset of sites or a larger but still not major ranking algorithm change.
Some say the ranking changes are only in Google UK but others are saying it is specific site penalties.
Honestly, it is way to early to make any assumptions based on forum discussions right now. But I figured I see if anyone else has noticed anything recently?