No one's really sure, could be any nuraber of things. Bandai's not in the best of shape right now, so maybe they're getting other releases out of the way before pushing R2 out the door. They could be running behind in the dubbing, hence the three week break in premieres earlier this year, in addition to the upcoming 2 month break (though that's not confirmed as the reason this time). That may tie in to the Japanese DVD issue, as Bandai usually gets the DVD masters of the series, and the last two volumes haven't been released yet (which contain episodes 20-25).
In any case, hopefully the first part of R2 will pop up on the next solicitation list.
True, and it's too bad about that, would have loved to get some cheap Geass or Gurren at the Best Buy sale.
At least Bandai stopped releasing the singles for the last parts of both series. With the 2-disc editions, there really was almost no need for the single disc releases. The LE versions for Geass, however, were the best ones I have ever seen for any series, and I hope they continue with that.