If a said board can do 1333FSB then Penryn is go, but don't quote me on that one as there not out yet. Some P965 mobo do work with 1333FSB/Penryn, but there have been problems with some 975X boards running them.
The Battle Axe2 from Intel have had trouble with 1333FSB processers, since then have pulled support. The P35 will do fine with Penryn/1333FSB. The 1333FSB is a requirement for Penryn.