I think you guys are reaching here. You think that they are going to be still wearing Superman T-Shirts under their suits or drinking Superman Tropicana OJ a year after the release? There are other movies that WB is prepping and preparing for, for instance, the DK. Last year was the year of Superman, this year it's business as usual at WB. I find the lack of news frustrating and aggrevating but it doesn't necessarily mean they aren't interested. Sure we all have our own theories:
"Singer is out, they are unhappy with him!"
"They want to do JLA because they have a 1st draft already!"
"Singer has delayed the sequel because he is working on other projects!"
The theories and speculation are rampant, but for the most part, that is all they are.