So, after much Googling, it seems I am as confused as before. I've been revisiting old images that were shot on a Nikon D200, and the colors/feel of it seems so much better than the D7000 and E-M5 images.
This has been much debated, but I am fairly sure that you are seeing differences due to other factors, like the different color filter array designs and different JPEG processing approaches in different cameras. The difference between CCD and CMOS technology only starts after the light has gone through the color filters and has been detected by converting the light signal to electron counts, so it is very hard to see how the subsequent electronic processing could affects the colors in the results.
1) Outside of Medium Format/Leica, is there any interchangeable lens cameras still being made with CCD?
2) My understanding is that the technical superiority of CMOS is in it's ability to read and possibly noise reduction, especially at higher ISO, did I miss something there?
Modern active pixel CMOS sensors have less sensor noise (not so much "noise reduction" as "noise avoidance"), which increases the dynamic range and shadow quality at any ISO speed, not just at high speeds.
3) With the demands of video on the chip, it seems CMOS is the only one to handle that properly. This means that CCD would also be unsuitable for mirrorless designs. Am I correct?
Yes, the full frame type of CCD used in all MF cameras until recently cannot do real time live view or video, so they are useless also in SLRs with a live view option. Interline CCDs (as used in some video cameras and some older and/or cheaper compact digital cameras) can do live view, but their still image IQ is inferior, so no SLR uses them anymore.
4) If read time was not important (i.e. not needing more than 1 frame per second), dedicated to stills, and ISO is usually between 100 and 800, typically at the 100, wouldn't CCD make more sense?
Once the very dubious idea that CMOS has inherently inferior colors is ruled out, I see no remaining advantage for CCD at any ISO speed: the advantage of lower noise and great dynamic range is there at any ISO speed, even if less important at low speeds, and the potential advantage of live view is always there. At most, the advantages of CMOS are diminished or even become negligible in some uses, but are not turned to a disadvantage.