Rook, I am as addicted to AE as you are, and that thought crossed my mind as well.
I mean, are we considering Tri Repeatae to be a double disc? The one thing I have to say is, in terms of Autechre's history with reviewers, pre-release press, etc., making this a double disc may be a well calculated move on several fronts:
1) More difficult to DL in one fell swoop
2) Harder to fake a leak. MAYBE some people could come up with nine 30sec-1min track previews that sort of "sound" like Autechre and could get people wondering, etc., but even less likely is someone capable of generating an entire album's worth of tracks that would convince people it was real. HOWEVER, it has happened before... It's happened with Confield and Untitled that I know of and some of those fakes were wonderful. Unfortunately the odds of someone coming up with TWO discs worth of convincingly fake new Autechre tracks would be very unlikely if not impossible.
3) Dropping a double disc would change up their formula, as this has been the longest they've gone without releasing something.
4) It would straight up be a baller move to drop a double disc of hotness on our faces.