IPTV and such...
Well, looking though the previous posts, it looks like there's quite a bit of confusion on the 622 and IPTV as well, at least in a home networking environment...
As far as using a firewall/router to separate the "Internet traffic" from "Video Traffic", well, the broadband connection just provides bandwidth, which is used for whatever... now, there are higher-level functions to keep things moving, like QoS (quality of service) limits that can tag certain types of traffic to be higher priority, this is usually what is done with both VoIP and IPTV traffic.
Basically, voice and video get higher priority because if their traffic stream is interrupted, the video or phone call will get artifacts, cut out or just stop. This is something that the providers will try to prevent, as a slight interruption in your data connection just means that Google loads in 4 seconds instead of 3 seconds, but if Monday Night Football gets choppy, then people get pissed...
That being said, i do think that the Ethernet connection on the 622 will be used, but as to when, who knows... that 320 gig hard drive is certainly pointing that DISH is planning on putting something there.
Now, for streaming content over the home network, Ethernet is definitely going to have an advantage, as it will offer up to 100 megs of full duplex speed. Wireless, even 802.11g, is still far behind in speeds, as the standard 802.11g's 54-meg connection is closer to 20-megs in actual real-world usage. This is plenty to stream one ATSC channel, or a couple NTSC, but not much more than that. The IPTV implementations have basically had the content coming from a server at the ISP, so your IPTV set-top box would tell the server through the network connection to please display channel 125, and it would start streaming channel 125. If you have multiple set-top boxes, they would each get their own stream. Even in a very high bandwidth environment (VDSL, ADSL2+, FiOS, etc) there's a definite limit to the amount of bandwidth available for video. Figure that an ADSL2+/VDSL line is running around 25-30 megs of downsteam bandwidth and FiOS is 'up to' 100 megs.
As for communications to DISH for account stuff (like PPV) i don't think they're quite there yet... they're just now implementing the DISHNet thing to share a phoneline connection amongst the receivers, so they're probably not quite to Internet connectivity yet... besides, they like the phone connection, as they get to see where you're calling from.
I'm also betting that the 211 is planned to be a ViP for Video over IP (or IPTV as everyone else calls it) set-top box, like (Amino, Humax, Pace Micro, 2Wire, MediaXcel), as the provider would stream content directly through the broadband connection right to the 211. A hard drive is not required for a STB, as i've seen one of the amino boxes which was about the size of a hockey puck...