I just got my GeForce 3 today, and no it does not support above 2x2 (4x FSAA). It does, however, use a different FSAA algorithms (multisampling and Quincunx) which look better than those found on the GeForce2. I must say I was quite critical of the price of the GeForce 3 when it was announced, but now that I've had a chance to play around with this card, I'm in awe, it was worth the money.
I also have a Voodoo 5 sitting in the closet, comparing the GeForce 3's FSAA to the Voodoo 5's I'd still have to give the slight edge to the Voodoo 5's 4x FSAA for the best image quality when they're both at the same resolution. However, the GeForce 3 can handle FSAA at much higher resolutions than the Voodoo 5, so overall the FSAA image quality goes to the GeForce 3 pretty easily, coupled with improved antroscopic filtering over the GeForce 2, the visual quality is just stunning.