You can see preview clips for ABC's new shows here. They'll release full trailers later today.
Can't find any others, but Once Upon a Time and Charlie's Angels are already up.
Once Upon a Time's preview looks awful but the full trailer looks good. Is that the same show?

Revenge looks promising. The River will probably get tiresome fast with its jiggly cam and obvious Lost-ripping-off. Apt 23 looks more boring than I'd hoped. I'd watch Suburgatory but it's really not my kind of show. Work It should be banned by the Geneva Convention.