It seems like everyone and their mother is jumping on the 3 & 3/4" train this year, and my only response is awesome.
So far, it looks as if we'll be seeing Star Wars scaled versions of the following:
Harry Potter (Corgi OOTP line being imported and distributed)
Star Trek (Playmates has confirmed the movie figs will be released in 1:18 scale, in addition to two other scales)
Hellboy (for the new movie, by Mezco)
Heroes (also by Mezco)
DC Universe (Mattel see HERE)
Indiana Jones (obviously)
as well Star Wars and GI Joe continuing. Did I also hear of a Marvel 3 & 3/4 line for this year? Am I missing anything?