Again, this HBO deal is clearly something the sprang up out of the clear blue - even some of the castmembers didn't see this coming, so that's probably made some waves behind-the-scenes, because all we knew otherwise was that Season 46 would be airing on PBS maybe a month or two ago, but again, the HBO deal came out of nowhere, and that, no doubt, has delayed the new season until further notice; our lack of information could be for legal reasons - they probably can't release any information until everything is set in stone and solidified. As for HBO not having any scheduling information, we can probably only assume at this point that either they haven't updated their schedule listings yet, or that haven't settled on a definite airdate.