1. I don't think so, though there seems to be a few around.
2. I don't think there's any real difference. I always liked the look and feel of the Officer's size 1911. I tried the Defender, Springfield V10, Kimber Ultra, Kimber Eclipse. ALL OF THEM FAILED AGAIN AND AGAIN with quality factory ammo. I'll never own another 1911, and especially not a compact. My recommendation to you is, if you have to have a 1911, don't go smaller than Commander size.
3. Someone else will know the answer to this question better, but I believe it's the revision. Internal safety changes and whatnot...