I was just contacted by someone who works with 42 Entertainment who tells me that all the major individuals (producers, writers, etc.) who worked on the Why So Serious campaign are in fact still with the company. Also, although 42E is not currently working on the Tdkr campaign, Warner Bros. could still contact them later on. Given that the film isn’t set to release in theaters until July 20, 2012, the studio has some time to decide if they want work with 42E again.
A youtube account going by the name of The Fire Rises (which you will remember