Some of the new images feature Hagrid's Care of Magical Creatures class, Trelawney examining Hermione's palm, as well as a group shot of Hermione, Ron, Fred, George, Percy, Neville, Seamus, (and possibly Ginny), along with several other students, looking up in amusement at something...
Note: HPANA is mirroring these since MuggleThai is no longer available, presumably due to traffic. Thanks to MuggleNet for tracking down the pictures after they went offline!
Harry and Hermione outside
Dumbledore and Filch (staircases)
McGonagall and Filch (with Hogsmeade checklist)
The Great Hall
Rosmerta, Fudge and McGonagall (Hogsmeade street)
Fudge and Harry speaking
Dumbledore and Snape among sleeping bags
Fudge outside Hagrid's Hut
Dumbledore in Hagrid's door
Lupin speaking with Harry
Lupin and Black in the Shrieking Shack
Black in the Shrieking Shack
The trio on the grounds
Harry and Hermione in Defense Against the Dark Arts class
Hagrid speaking with the trio
Harry (facing Buckbeak for the first time)
The trio viewing hippogriffs
Aunt Marge beginning to inflate
Students watching (unknown)
Trelawney inspecting Hermione's hand
Harry Potter again
Note II: In related news, DanRadcliffe.com has also posted a nice scan of the back cover of TV Guide featuring an ad for the May 9 airing of Harry Potter and the Sorceror's Stone.