According to the website of Carbine Studio’s (makers of Wildstar), the developer has started working on an unannounced title.
They’ve listed five positions, including animator and lead combat designer. But what might they be working on? A new IP, regardless of genre, seems most likely, but maybe they’re readying up a complete overhaul of Wildstar’s combat to be included in a major expansion (Carbine sure likes to stoke the Wildstar fires whenever possible). Or they could be working on a Wildstar MOBA, or a card game brawler. Who knows.
After Wildstar’s not-quite-success, I can see Carbine trying something a bit more smaller-scale, but you never know.