With this hardware generation, most likely network DVR streaming, and more interactive features. including Shomi. But they promised all sorts of things, and delivered few of them.
Anything that requires new hardware won't be ready by 2020, and if anything, new receivers by 2018. They just got the 6xx series going more or less. I don't think they or the "normal" customers would stomach another change so soon.
What they could do is coax networking, and something akin to DirecTV's SWiM, and have a 4 tuner terabyte DVR.
But anything they do would have to suit a broader audience, not just enthusiasts/high end users.
I think G1/8PSK/MPEG4 as far as delivery goes, is stuck for another decade plus.