Personally, I haven't discovered any new genres, but I've definitely (re-)discovered lots of artists, fell in love with their work etc.
My biggest story of the year is hip-hop, a genre I have been listening to for more than 10 years (but less so now than back then). It started last year with Mos Def...
But this year, it all started with Lil Dicky. I knew about him from the previous year(s), but it was this year in which I really discovered his works, and started to enjoy them. It's equal parts humour, and finding some of myself in his serious works. His music is so weirdly unique to him, but also really accessible, a breath of fresh air in the modern hip-hop scene. His TV series is also very very good. Just digging his personality, it's so different to any other rapper.
After that, it was Mac Miller. I discovered him only recently, knowing nothing of him before. Listened to a couple of his albums, and was positively surprised. The Divine Feminine is a fine album, something I haven't heard before. The entire album is pure love and passion, which is just so nice to listen to. Top-notch stuff.
And just this December, just this past week, I've decided to check out Common's works again. Before, I've listened to a couple of his early albums, and thought they were ok but haven't grabbed me. But this time, I just checked out some random stuff, from '94 till today, and really enjoyed a lot of them. Definitely gonna keep exploring his discography. Love his more jazzy/soul stuff, with easier beats more focused on the real instruments and sampling. Heard a couple of Kanye's beats and appearances there, he's probably next on the list.
These three have reignited the love I always had for rap.
As far as trance goes, I still haven't lost my love for it, even though it sometimes took a back seat. Due to this new forum, I've been discovering more trance and related stuff this year, and definitely enjoyed a lot of releases. The list of the releases I liked is really long, although only a couple of 'em are still with me even now. Again this year, every year since 2014, the classics were the best tracks I've discovered, and this year I've explored trance's early history, the first 10 years more than anything else, along with some prog from the turn of the century.
That said, I still think it wasn't a bad year for trance, overall. A couple of comebacks, a couple of fresh faces and good albums, lots of good releases...
The trance track that blew me away was Last Train To Lhasa by Banco de Gaia. I think I've discovered it this year, on the old forum, and was just blown away by it since I haven't heard anything like it.
As far as other genres go, I'm still where I was a year ago. I still explore some other stuff, but trance and related stuff, along with hip-hop just make too much of the stuff I listen to.