To me, that tweets translates to:
"The men behind the Ibizia videos will be revelaed shortly. Buckle up. Earthquake."
Don't think there's a source besides that guy's twitter.
Looks to me like they are going to expose who dropped the video, and that's the bombshell, not that other Austrian pols will be exposed.
Depends on "Hintermaenner". Whether he means the men behind dropping the video, or the the background of men being talked about in the video. 1st option makes much more sense to me.