Infinity War trailer dropped today

[BmorePat87]

So it seems like Thanos was tracking the stones when he stopped Thor's ship at the end of Ragnarok. Based on what we know from the leaked trailer last Summer, Thor goes flying through space during the battle. Thanos is seen with a purple stone, so he has the Power stone that the Nova Corps had been protecting. So with that, his power is increased and he can kick Thor's ass.

We also see Loki hand the tesseract/Space Stone over (likely to save himself and the Asgardians). It's possible Thanos used that to send Thor to another part of the galaxy.

So Thanos has two stones so far. No sign of the aether/reality stone, which is in possession of the Collector.

Hulk somehow gets to Earth and lands in Dr. Strange's place, so I am guessing he gets there while Thanos uses the space stone to send some people there to retrieve the Time Stone (Eye of Agamotto) from Dr. Strange.

The Vision seems poised to lose the Reality Stone from his head.

Wakanda is under attack, suggesting the last stone, the Soul Stone, is there and likely the reason Wakanda is so advanced.