I thought I'd google this & found this:

Projekt Revolution (w/HIM and more TBA):
June 21st - Reitstadion Riem, Munich, Germany
June 27th - Waldbuhne, Berlin, Germany
June 28th - LTU Arena, Dusseldorf, Germany
June 29th - The Bowl, Milton Keynes, England (w/Jay-Z)

found in thread here:
http://www.lpassociation.com/forums/showthread.php?s=2c87dd7205572e10faba6ebcdd5b04c8&p=768631#post768631

Also found this:
New Europe Dates / Linkin Park & Jay-Z Present Projekt Revolution

Linkin Park will be performing in Spain, Portugal, Germany, Switzerland, and Italy, as well as a special show with Jay-Z in the UK!
Don’t miss out on this special show – Linkin Park and Jay-Z Present Projekt Revolution 2008 at The Bowl in Milton Keynes, UK, on June 29, 2008. LPU members will get access to presale tickets for 48 hours beginning March 5 at 9am (local time). Tickets go on sale to the public beginning March 7 at 9am.
LPU members will also get access to presale tickets to the Linkin Park Presents Projekt Revolution 2008 tour dates in Munich, Berlin, and Dusseldorf. HIM will be the supporting act with more to be announced soon. The LPU presale will last 48 hours beginning March 5 at 9am (local time). Tickets go on sale to the public beginning March 7 at 9am.


located here:
http://linkinpark.com/story/News/new_europe_dates__linkin_park_and_jayz_present_projekt_revolution-1

I don't know for sure if its official, but this is what I just found. No word on whether or not HIM will join the PRT in the states.