A day after teaming up onstage during Kanye West's headlining set at the Summer's End Musical Festival in Tempe, Arizona, the GOOD Music duo are hinting at a soon-to-be announced new project.

On Monday, Travi$ Scott posted an Instagram photo of himself and West together on stage with the caption, "Travis x kanye Soon."

In another Instagram post on the same day, which shows a drawing of the two rappers performing on stage, he wrote, "We got something we been plotting for years now thats about to surface."

 WE GOT SOMETHING WE BEEN PLOTTING FOR YEARS NOW THATS ABOUT TO SURFACE

A photo posted by flame (@travisscott) on Sep 28, 2015 at 10:20am PDT

Scott has been working with West for quite some time. The Houston rapper contributed to West's rambunctious track "All Day." Yeezy was also featured on Scott's debut album "Rodeo" in the experimental track "Piss on Your Grave." It isn't surprising the friends and recording artists are teasing the launch of a new music project.

What could the new project be?

It could be the "Piss on Your Grave" music video.

The pair could also announce a mixtape. The popularity of Drake and Future's "What a Time to Be Alive" shows that fans are thirsty for collaboration efforts. Since Scott dropped his debut album a few weeks ago, releasing another whole album with Ye is unlikely, but a mixtape is possible.

It could also be a joint tour. These two recording artists on the road together would be a match made in heaven. They're both great onstage performers. La Flame, in particular, thrives on the rowdiness and hype of his live concerts. That energy, paired with West's live artistry, would make for worthy entertainment.

It might even be the release of West's highly-anticipated "Swish" album. In March, Scott told MTV News that he's involved with West's upcoming solo LP.

"He doesn't like when people speak on this album, but yes, I can say I'm involved with the album, for sure," he said.

What do you think West and Scott's big announcement will be? Share your prediction in the comment section below.