It is mentioned in the RWZ arcs (Serpent Drummer's) that the Rikti fought them off about a hundred years ago. It is not clear if the Rikti fought a version of the Battalion native to their universe, or if the Battalion is a cross-universe threat, etc. One of many reasons why parallel-world stories should be avoided, but that's another rant.
On our side, Prometheus is now saying the Battalion is "the coming storm" and they're responsible for the (thus far) attempted genocide of the Kheldians. The Shivans are supposedly their "scouts", although just how effective mindless blobs that destroy everything in their path are as "scouts" is not exactly clear. That's all we have on them so far.
Current Blog Post: "Why I am an Atheist..."
"And I say now these kittens, they do not get trained/As we did in the days when Victoria reigned!" -- T. S. Eliot, "Gus, the Theatre Cat"
OK, I've looked at the comics, dev notes, the wiki, earned a badge from chattering with a big old weird blue guy, etc.
I know the Battalion appears to be our next epic enemy, but has there ever been any official details about them?