I believe only the Apple bumpers were available on the 4 release day. For the 4s you had all the same cases for the 4, some were compatible and some had flash issues but they all fit the same.
I went to Verizon and AT&T today. Verizon had 4 cases out. No brand names except one Incipio case. Att showed me a list of what they are getting. A few otterbox, Incipio and I think it was speck but I'm not sure about the speck.