Just curious if we're ever going to see another big box release or if they're done now that each of the houses have their own.

I don't think anyone knows. They've been mum for so long, it's hard to say what's going on. I do find it interesting that they made the change to the distribution model of the Call of Cthulhu LCG; there will be no more Asylum Packs for that game, instead there will just be Deluxe Expansions three or four times a year. My theory is that they made the reverse decision for AGOT (no more Deluxe Expansions, just Chapter Packs), but made no formal announcement.