Yes, there's a seperate website www.bushinberlin.de, first page " if/when Bush comes we come,too" (literal translation), Bush Alarm. There are lots of discussions on German indymedia about Mayday violence, most people seem pissed off with the rioters especially because demonstrator got hit, too. Quite a few commentators also mentioned that they'll be doing stuff for Bush, kinda like" we fucked up Mayday, let's do something more effective when Bush comes over". So yes, something will be happening in Berlin for sure.

Most of the information on the sites should be understandable even if you don't speak German. It's mostly dates and addresses of demos, direct action etc. (on where they start), Demonstration means demonstration etc. I can't translate the website, there are only lots of short pieces of information. They've organised accomadation as well, so just send them a mail in English (they all understand it) at "Kontakt". Have fun!
Bush will also be going to Moscow (in between Berlin and Paris).