He's creating a truly magnificent universe with the Cosmere. As I understand it, he expects it to reach 32+ books total. It's all centered around Stormlight Archive, which is an ongoing 10 novel series.
The killer detail that helped win me over as a big fan was the fact that he communicates with his fans. He's a fast writer, but he still gives updates. After a few years of following GRRM, having an author that so openly speaks with his fans is a breath of fresh air. I think everyone is usually aware that estimates are never truly accurate, but at least it gives you an idea of what the author expects to accomplish. If he says he's hoping to get the next Stormlight Archive book by the end of next year, I know that doesn't mean it's definitely going to happen. But that's fine, at least he's being open and communicating with his followers.
Honestly, I think Stormlight Archive has blow away pretty much everything else I've read.
This year I discovered a genre called LitRPG [0] and picked up all the major books in the genre. It's very light reading, for when you just wanna go off on a brief adventure. I enjoy videogames but I tend to find myself too tired or busy to want to go into the grind myself, so this made for an entertaining proxy.
[0] http://www.theverge.com/2016/5/28/11801040/have-you-heard-ab...