It really has nothing to do with anything.
Well, we don't know that for sure until we hear the album. When the cover art for BC&SL came out, everyone thought it was freaking weird because it was a hodge-podge of images thrown together, and without the songs' lyrics for meaning, no one knew what any of it meant, except for some connection to the album title itself.
And with SC, the ants made no sense and to this day, still do not make any sense to me. What do the ants have to do with anything? Maybe nothing, but it's kind of cool and they're all over the liner art as well, which is pretty neat. I think what Huge has done for the album art (cover AND booklet) for Dream Theater's last 3 albums has been pretty good, despite it's (apparent) meaninglessness, but once we get to see the whole booklet for ADTOE and hear the songs, all the art might make more sense to us.
-Marc.