We got him at the end of GOTG2.
People kind of forgot about him completely and I haven't heard of him for a long time.
I'm not a comic reader and I don't really know a lot about him but why do you think is gonna happen with him?
I'm guessing they added Thor to the Guardians because they needed someone of his level for Adar Warlock. Thor will fend off the main threat (Adam) long enough to get others time to bring him or his evil plan to a full stop.