The Vibe has only been sold as a 4 door hatchback so far, and there's no indication that Pontiac will try it out with any other body styles. The Vibe comes standard with front wheel drive, but four wheel drive is an option that some buyers are selecting, but it's only available as its own trim line, which is kind of a strange sales tactic on Pontiac's part (do they still have people working in marketing?).
The base engine on the Vibe is an I4, but there are options up to a V6, which is sold on the Vibe GT.
For 2007, there is only the base model. The GT and all wheel drive trims have been dropped thanks to slow sales. What a surprise.
The second generation Vibe starts in 2009. The all wheel drive and GT trims will be back and redesigned to sell better in the American market. These will now be built by Toyota and sold in the U.S. as a Pontiac Vibe and a Toyota Matrix.
The first Vibes are starting to show up on the used car market. If you would like to buy a used Vibe, there are several places you can look. They'll have them at some Pontiac dealers, but you'll be paying more than blue book in most places and you'll get the heavy-handed sales pitch for the newer cars. Try looking on eBay if you want to avoid the pressure and get low prices.