In an Статья about Travie McCoy in Mercury News, he mentions the progress of the upcoming Gym Class Герои album, saying that they did a track with Avril!

"The New York native is reveling in the opportunity to work and perform solo. But McCoy also says Gym Class Герои remains his main artistic priority.
A new Gym Class Герои album should be available later this year, possibly by the end of summer.
"We've done a lot of preproduction for the Далее Gym Class album," he says. "We're at the stage now where we definitely have a lot of demos. After this tour, we're going to go and take the cream of the crop and start refining the songs and start putting the album together.
"We have a few songs that are kind of already in the bag. One song we did with Avril Lavigne is awesome."

Source: Travie McCoy goes solo - San Jose Mercury News