I think HGTV HD is due in March, and Food HD 2 or 3 months later, and rumors abound that Nat Geo HD will be coming "soon." I'd love to see it, but I'll believe it AFTER I've seen it.
If you signed on for a ViP622 now, it would probably be late March or into April before your install would actually take place. The ViP622 shortage may ease a bit by then, and there also seems to be a shortage of DPP44 switches. There may or may not be an installer backlog.