According to the solicit for Justice League #22:
TRINITY WAR, the action-mystery event of the summer, begins with a full-length epic adventure! The death of a hero ignites a violent war among the Justice Leagues! It’s League vs. League vs. League as an impending darkness approaches the DC Universe. But the truth behind it all will lead to an evil that threatens every hero on the planet. And what does the Secret Society of Super-Villains have to with this? Everything.
So who do you think dies? Obviously everyone in the cover can be ruled out so I'm not really sure who could fit that spot. The solicits also say that:
- A hero gets arrested (I guess that could be anyone, since this is a war and all)
- A hero goes rogue
- A hero leaves the regular Justice League for Justice League Dark
Although I have to say I'm not very happy with these news. I'm tired of comic book deaths just like everyone else