This camera first appeared on the web - unofficially - around NAB, but details were sparse. Now it's almost here, and we know a little more about it, including that it has a single 1/2.88" back-illuminated Exmor R CMOS sensor. While it's sold by Sony's professional video unit, some describe it as the consumer HDR-CX550V that's been prettied up a bit; larger battery, lens hood and mic.
While it comes with a small shot-gun mic, it only has a 1/8" audio jack. It's unclear whether it has any other new features in the firmware (like zebras.) While the mic looks like it's molded to the camera, it's actually slotted into a hot-shoe mount with a rubber cover.
It's a nice looking little camera, but you're paying $400 for those extra features...
Sony: HXRMC50U Ultra Compact AVCHD Camcorder
B & H: HXR-MC50U Ultra Compact Pro AVCHD Camcorder ($1,599.95)
B & H: Sony HDR-CX550V 64GB HD Handycam Camcorder ($1,199)