Harry and mates ended up in dept of magic, trying to rescue a prophecy about himand voldemort - basically one of them will kill the other one (at the end of book 7, I guess!)In commtion, Sirius killed. Harry v angry with Prof Dumbledore, dumbl v apologetic.
HTH, i haven't seen the new one so don't know if these are the details you need to know!
triwizard cup was a portkey, took harry to voldemort and wormtail who did a spell and potion to revive him. Snape refused to go back when the dark mark on their skins burned calling them to voldemort. Cedric diggoey killed by voldemort. anything else you need to know while im on a roll??!!