The Ultimate Collector's Series, or UCS, is a LEGO subtheme of Star Wars introduced in 2000 and was meant to be more detailed and aimed at older builders. These Ultimate Collector's Series sets tend to be larger, and more expensive than typical sets.
2017 LEGO Sets
2017 was a big year for the LEGO movies with the release of The LEGO Batman Movie and The LEGO Ninjago Movie. With these films LEGO gave us a number of new sets and themes around these movies, with many of them already being significant investments for collectors. We also saw a number of new themes released that year including BrickHeadz, DC Super Hero Girls, Boost and of course sets for The LEGO Batman and The LEGO Ninjago movies. However, sadly as it is LEGo did retire the much beloved BIONICLE and Mixels themes as well as the short-lived The Angry Birds Movie theme.