Turns out that the Austrian outfit
"EU-STOP" (which got about 2.8% of the vote) actually took legal steps to nullify & repeat the EU election (1 day before the deadline to do so ended).
One of their reasons is the case in Germany, in which a prominent German-Italian journalist admitted to voting twice in the EP election: One time in Germany and one time for Italian MEPs.
The case will now go to the Constitutional Court, which will rule within 4 weeks if their request is reviewed further or not.
http://www.tt.com/home/8527786-91/eu-wahl-von-eu-stop-angefochten.csp...
So far, only 1 election has ever went to the Constitutional Court here, in 2004.
But the candidate of the party (FPÖ) sent the formal objection after the deadline to do so had already passed, so the case was not reviewed by the Court.
Will be interesting to see what comes out of this, if anything at all.