I've yet to obtain any of the figures other than the 2009 SDCC 6" Exclusive Slimed Egon. So... I am a bit behind on that too. The 12-inchers are a bit out of my price range and the 12" Ray Stantz is (at this time) SOLD OUT!
At last we get to see both sculpts of Dr. Peter Venkman! It seems the initial release of the 6" Peter will be a "slimed" version - it looks like he bathed in baby food. The miniscule Venkman ships in June. The twelve-incher ships in April... hopefully... if there aren't any more delays.
Lab Coat Ray is part of the 6" line and is a variant based on the character's infamous tv commerical seen in the 1984 film. He also includes the sewer ghost from the film and will be available in August. 12" Winston Zeddemore comes in August as well... sadly he does not include "shit that will turn you white!"
Ol' dickless here is (ironically) part of the 6-inch line. Walter Peck includes the Ecto-Containment unit... unfortunately he doesn't come with a Con-Ed employee to help him shut if OFF!
Rumor has it that the first of the "Real Ghostusters" figures that Mattel is working on will be unveiled at SDCC 2010 in July.