Don't hold your breath on more power. With a brand new engine, its very unlikely there with be a power increase after 1 year. The 99-04 models never once had a power increase. Also, with Ford now getting into specialy models (bullitt, mach, boss, etc.) their lineup has to justify the prices they ask. Therefore, the Mustang GT will always have the least power (besides the v6) Anyone looking for more power from the current platform will probably only find it in the SVT or other special production stang.
For the record bullitts would look sweet on the 05. Maybe an all silver 18 X 9 rim. Never been a big fan of stripes but i think it would look at home on the new stang. I would have to see one in person.