1. No, current CableCard spec. to my understanding is not compatible with the 2-way cards coming out. Your set will always only allow 1-way CableCard.
2. You don't run coaxial from the wall into any receiver, you run it directly into the TV or a cable box. From the cable box you run video out to the TV and audio to the receiver (or video to the receiver then to the TV). If you are using a TV w/CableCard, then you run audio out of the TV to your receiver.