The Avengers: Infinity War teaser trailer showed that Thanos will get his hands on the Space and Power Stones, and judging by Vision’s encounter with one of the Black Order, I worry that he might not have the Mind Stone for much longer.
Here’s where five of the Infinity Stones are now as of Thor: Ragnarok: the Space Stone is in Loki’s possession after he snagged it from Odin’s treasure room before Asgard was destroyed, the Reality Stone is still held by The Collector, the Power Stone is in the Nova Corps vault, the Mind Stone is resting on Vision’s forehead and the Time Stone is safe within Kamar-Taj.
We still haven’t been officially introduced to the Soul Stone yet, though there’s been no shortage of speculation as to where it might be, from Wakanda to already being in Thanos’ possession.
However, it remains to be seen if Thanos will ultimately be successful with his mission of if the combined power of the Avengers and the Guardians of the Galaxy will be enough to stop him.