Here's a response from Eastlink I got today:
Originally Posted by Eastlink E-mail CSR
It is true that EastLink is investigating several new receivers, but we have
not publicly announced which one we will be using. The DCX3400 receiver is
among the models being considered, and has tested quite favorably. We
encourage you to check eastlink.ca regularly for the announcement of our next
generation of Digital Cable receivers.
They didn't respond to my question about upgrading.
Panasonic 42PZ85 + Eastlink - iPhone 4 32gb - MacBook Pro 15.4 Hi-Res 2.2 i7 8gb 500gb + iMac 27 3.4 i7 12gb 1tb