I presume it means they will stop butchering MPEG feeds that are low in bandwidth by trying to interpret the "blocks" and pixelated sections as meaningful data. If, for example, they just tried to guess, "Hey, this feed is a crappy digital cable/DSS/Dish feed that has too little into, let's not even bother," the DRC would be better. Honestly.
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.