That's an easy one: 5e.
Truth is, I'm not terribly interested in 5e any more. I care about it because I care about D&D, and I'll probably end up picking it up. But it's really starting to look like it's just not for me.
But I have no interest in Numernera, or 13th Age, or DCC, or really any other new system. They all look cool enough, but I don't have enough time to play the games I already own (or even just the subset I want to run), and I really don't need another set of rules to do, essentially, just the same thing.
(It's increasingly looking like the future is my own SWSE-derived version of the d20 rules, which I'm working on in my spare time. I'm just getting picky, so I think I need to set things out just so...)