Steve
I think you are referring the 24P, which for the reasons you have listed are not true. Progressive scan is not just about the "film look", 24P is about duplicating the look of 24fps of film. Progressive scan gives better resolution, color and motion properties with REDUCED motion artifacting caused by interlaced sensors(aka combing). 1080i has a reduced vertical resolution of about 700 lines, hence detail is NOT lost while progressively scanning, but actually increased especially with subjects in motion compared to interlace video. If any lost at all, it is due to the HDV codec. Best example is to try reading text from a CRT interlaced TV and a computer CRT progressive scan while outputting from a computer. See which one is harder to read (ie lower resolution).
Furthermore, the V1 mic extension can be removed so basically the housing will be the same as I doubt any housing manufacturer would want to tool for 2 different housings with 3mm difference in height. Except for the top handle portion for XLR inputs and the mic extension, the FX7 and V1 are dimensionally the same.
Limey, are you sure you even want to shoot in progressive mode? Just because it is there doesn't make it necessarily desirable. Think, it is rolling at a slower speed producing this 'film look' that seems to be so important to many. But for underwater shooters, film look equates to a softer image, not as sharp and with greater chance for artifacts. Is that really what an underwater shooter wants? I also have concerns as to whether I should get the FX-7 or V1-U but it is not because of the progressive ability of the V1. I have a brand new A1-U with an equally new Gates housing I will be selling as soon as I can make up my mind but it is not because I miss having a progressive feature.I doubt if the housings will be the same for either of the new cams. The FX-7 has the standard built in mic while the V1 only has the XlR mic. If the housing manufacturers decide to build the V1-U to allow the mic then you can expect it to be considerably larger than the housing for the FX-7. The V1-U has a naturally larger footprint. I just wish I hadn't sold my L series batteries to Mark in Palua as now I will have to buy new ones all over again.
Steve B)