Please remember that this is a rumor.
via Faeit 212 (A Must Remain Anonymous Source)
On the subject of leaked releases,
I can't confirm whether or not it's 100% accurate, but I can confirm that some of the items have true names. The Medusa land raider variant, and skyshatter specifically. This is relevant because the playtest names for these items were "AA Landraider" and "AA Thunderfire."
These items aren't in any sort of playtest rules beyond having data sheets for random use with the existing 5e books for people who are involved in that area.
As of Friday afternoon GMT though there was neither a shit storm, nor a laughing house though over the rumors, and maybe the people who's heads would/will roll simply hadn't seen it yet.
I'll get back to you on Monday.