Updated 09/09/2013:
Day 1 - October 25th:
ATB
Benny Benassi
Claude VonStroke
Cosmic Gate
Datsik
Deorro
Delta Heavy
Dillion Francis
New World Punx (Ferry Corsten & Markus Schulz)
Hardwell
Umek
W&W
Day 2- October 26th:
Afrojack
Baauer
Boys Noize
Dada Life - [unconfirmed;rumored]
Dash Berlin
Destroid
Jack Beats
Minnesota
Nicky Romero
Savant
Sebastian Ingrosso
Unconfirmed Freaknight day appearance:
Calvin Harris - rumored
Dirtyphonics
Infected Mushroom - rumored; said in Paradiso interview they'll be back for Freaknight
Tritonal
Vicetone - rumored; currently touring for Nicky Romero's North America tour (could make appearance at Freaknight)