There are a few new cameras that have been released by Canon and Nikon in the last few weeks. None of them are on the market right now, so I I cannot say anything about the performance of the cameras (or what you need in a camera), but the Canon S100, the Nikon CoolPix 7100 and the Nikon AW100 are all interesting choices.
The Canon S100 is an updated model of the S95, a small camera that has nice results, pocket sized and thin. I have shot some on the S95 and have seen what friends and family members have shot and it does real well. RAW, HD Video of various flavors but no viewfinder and certain other things. But for something to throw in the pocket and get good shots.
The 7100 looks like what Canon should be doing with the G series. Has alot of features, around the size of a G12, 20-200mm lens, RAW, HD Movies and the rest.
The AW100 is one of those "tough cams" that can be dropped 6 feet, waterproof to 30 feet or so, etc. Unlike the other two (and like all the tough cams) no RAW shooting.
All claim to have faster speeds, better image quality, etc, but until tests come out, never know for sure.
Keep in mind that all of these will be a nice jump up from the a570is in every way, lens range, features and the rest, so you should be happy with the choices. For instance the A570IS did not shoot RAW and two out of the three new ones shoot RAW, all shoot video, etc. Give a good look at the specs of those and keep on eye on when they are available to try them. The AW100 I think is the earliest one coming out, may be out as I type, the others a bit later. I think the S100 is early November.
I have all these on my serious to look at list for their various features and when/where they will be fitting in.