Sony has a new HDV camera coming out soon that uses interchangeable lenses. Preliminary info from Sony:

1/3-inch 3ClearVid CMOS Sensor™
The new camcorder will incorporate new 1/3” 3ClearVid CMOS Sensor system for optimum picture quality. Thanks to the unique grid arrangement of the photo diode sensors, in which each is rotated by 45 degrees, sensor resolution has been optimised while maximising the photosensitive surface area. The sensor works in combination with the Enhanced Imaging Processor™ to provide high sensitivity, low noise and a wide dynamic range. The 3ClearVid CMOS Sensor also eradicates picture smear and is less demanding on power consumption, thus delivering longer battery life.

Flexible Lens Options
The handheld camcorder is supplied with an interchangeable HD Carl Zeiss lens with 1/3” bayonet joint mechanism, allowing the flexibility of attaching existing 2/3” or 1/2” lenses with a standard lens adaptor. Lenses from the popular Digital SLR – a System from Sony can also be used with a special adaptor.

Native Progressive Recording Mode
The new HDV camcorder has both native progressive and interlace recording modes. In the native progressive recording mode, the 1080/25p image is recorded in HDV format. It is ideal for film-makers on a budget.

Full Compatibility with Current SD Systems
HDV/DVCAM switchability offers future-proof purchase for current DVCAM users. The built-in down-converter offers DV signals through the i.LINK connector to your current DV non-linear editing system.