So I saw this thing and I'm not sure how it really simplifies wiring and mounting. If you want it on the ceiling, you have to mount it... Yes, the cables are shorter. Not much more exciting.
If you want it in front, you don't need to mount it, but you need free space directly below a permanent screen. And you can't have the projector moving around, so it more or less is fixed in place.
This is like having a really big projection TV in many ways.
I'm pretty sure this didn't have a color wheel (although not certain) but I did see some color separation-type effects at least when your eye got near the projector itself. I'm not sure that would happen in a real room, but it might.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.