So, I went ahead and tried asking Iggy Azalea on Twitter about Mike Posner’s part on her upcoming EP, Glory, that is releasing on June 1st. Luckily, she replied!

@MikePosnerHits hes singing on a song called flash and its a pretty sexy song.

— IGGY AZALEA (@IGGYAZALEA) May 12, 2012

And there you have it!
A new song by Iggy Azalea is titled “Flash” and it features Mike Posner.

Update:

Mike mentions and confirms his collaboration with Iggy Azalea.

“@IGGYAZALEA pleased to say mike posner will be a part of glory. iam hype as fuck! love his voice.” honored, u ill. i just finished our song

— Mike Posner (@MikePosner) May 13, 2012

Flash, Glory, Iggy Azalea, Mike Posner