Somebody posted on a previous page about possible dates and venues for something new MOS related and mentioned CinemaCon. Just read that the first footage from I, Frankenstein will debut there and looking at the schedule and it seems Warner Bros. will have their almost 2 hour presentation on Tuesday, April 16th:
It'd be pretty much a given they'll show something new from MOS with Snyder and, maybe Cavill, in attendance but unfortunately we'll just have to deal with reading impressions and reports than seeing anything. 
 
Last year Nolan was there with new footage from TDKR including the tweaked prologue where Bane was more audible and WB and Peter Jackson also debuted the first 48fps footage for The Hobbit.
So yeah that could be a good week if a new trailer debuts with 
42 on
 April 12th followed by the 
MTV Movie Awards on the 
14th which could offer an exclusive trailer or trailer 3 if 42 doesn't pan out and then CinemaCon footage on the 
16th which we'd hear about on Wednesday in the trades like THR.