Unlike some of the other folks here, I'm more interested in reliability and performance enhancements rather than new features. The best new feature I've seen is the one that came out shortly after I bought my Tablo, the live TV guide on Roku. Other than that, everything else has been a "nice to have" feature, but above all else, I value stability and reliability the most. My Tablo is performing like an appliance that I don't have to think about. It took a while to get to that point with antenna and network upgrades, but I'm very happy with it now, so much so that I have more TV recorded than I can possibly watch, so I'm looking forward to the next hiatus when I'll have the opportunity to binge watch and catch up on some of the new series that I haven't had time for.
Anyway, "reliability and performance enhancements" is just fine with me... the last thing I'd want is the addition of something I don't really need at the expense of that. Sure, some of the TiVo features like automatic commerciaql skip, fast playback, and the ability to fast forward through video in second-by-second full screen might be nice, but I've gotten used to what I have, and value other features that Tablo has and Tivo doesn't, such as the ability out of the box to stream to multiple devices, and the ability to connect with my computer and phone while away from home. So long as Tablo continues to perform reliably for me, I'll continue to value it as superior to Tivo.