I'm pretty sure this is the 06 Impreza facelift, since the next gen Impreza is scheduled for 07.
I'm pretty much relieved at most of the changes. The grille is still awful, but more tastefully done than some of the concepts. I'm not liking the revised headlamps although most people will probably disagree with me. The foglamps look good integrated into the bumper. The taillights are really bad - half clear-cornered looks strange and awkward. The switch from Subaru lettering to the Subaru badge is a nice touch though. Pretty sure everything else about the car stayed the same, especially since the interior was just remodeled for 05.
I'm glad I got my WRX in MY05 vs MY06. Even a tasteful rendition of the new grille is still ugly.