Well, for what it's worth, if you go to the Nokia site they have a countdown clock. The clock points to Friday, not Sunday.
Nokia supposedly booked times square for a release party on Friday at 7pm.
Nokia Lumia 920 White/Red, Microsoft Surface, Amazon Kindle Fire
Nikia Lumia 900, Motorola Xoom, Focus S, Lumia 710, Dell Venue Pro, HD7, Droid Bionic, T-MobileG2x, HTC Sensation, HD2, Nexus One, Cliq, MyTouch 3g, TP2, AT&T Pure, Xperia 1, AT&T Fuze, Touch Dual, Hermes