Why would we get Superman in a Batman set?
It isn't Marvel vs. Capcom or something like that :P
And besides, even if they would only give us one single Superman MF in one single set, they would still have to pay for the entire license. TLC isn't stupid, they'll either give us an entire Superman line or nothing at all.
UMMM they are both DC Superheros. That would be awsome if they did make JLA legos. :oD
UMMMM NO!
Licencing doesn't work like that. LEGO either has licence to use Batman and related properties, or in the alternative, they have a licence to use the complete pantheon of DC characters. Right now, it looks like this licence is limited to Batman. Sure, its possible that the licence may go further than what has already been revealed to the public. On the other hand, simply because LEGO has obtained licence to use Batman doesn't automatically grant them licence over any other DC intellectual property. Licencing agreements are usually very strict. In short, unless DC has expressly granted LEGO licence over other non-Batman characters, I wouldn't expect to see Superman anytime soon. Of course, if this line does well, its entirely possible that LEGO and DC might explore that option.
Later.
Sorry i did not mean they could do superman or JL i was correcting him about saing Marvel vs Capcom it's actually DC vs DC