Based on a February ruling, Meek Mill, currently on house arrest, can't release any new music until at least June. That doesn't mean he can't preview new music, though (or, at least, for the sake of his parole, hopefully it doesn't mean that).
He recently previewed his remix to Drake's "Summer Sixteen," turning the page on another chapter in their ongoing back-and-forth, initially sparked last summer. In the short clips, Meek doesn't address Drake directly, so we'll have to wait (months, maybe) for the full version to find out if he's taking shots or just jacking the beat.
On the original, Aubrey fired some jabs, claiming that Meek and his team were in the same hotel when "Back to Back" dropped, and the OVO clan kept on turning it up and running it back. Meek responded to that immediately, though, with the release of "War Pain."