The price is looking to come in at $399 if the quickly pulled listing is correct.
A brand new special edition 'Halo 4' Xbox was listed in Microsoft's online store today and was quickly pulled. While this sort of leak is usually unreliable, the fact that it was Microsoft that posted it lends some credence to its legitimacy.
The system is slated to pack a 320GB hard drive, two controllers, special sound effects when you turn on and off the console, a headset, and some free downloadables. Oh, and a copy of 'Halo 4' of course.
The price listed was $399, which seems just about right for the system and pack-ins. Hopefully we'll see this back up there soon.
Source: Game Informer