I wonder if them showing Revenge on Wednesday is also a testing of the waters to see how well it rates for a permanent move?
I think showing Revenge on Wednesday is only a temporary move, at least out of necessity. On May 14 there is a Monday night AFL match between St Kilda and Carlton, so while Sydney and Brisbane is expected to have the usual line-up, Melbourne, Adelaide and Perth will get the footy on Monday, meaning Revenge will have to be shown on May 16.
Seven's Tuesday and Wednesday schedule could well depend on whether Nine shows The Voice on Tuesdays. At the moment, the live shows will air on Monday with no results show scheduled (the public voting results will be revealed on the following Monday's show). If The Voice airs on Tuesday as well then Seven could move Australia's Got Talent to Wednesday, otherwise AGT will keep its Tuesday timeslot.