I certainly wouldn't rule out a 90" this year. The pieces to make it happen are largely in place and the logistics of a 90" (vs. a 100" or larger) are somewhat easier to achieve.
Sharp is a mess, but they understand that owning the 70" and up segment is a chip in the big game and one they have the opportunity to control for a long time.
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.