Hard to say when Dish will actually pick up the HD version, maybe "by the end of the year"?
Er, and to get on topic, I am looking forward to Daily Show/ Colbert Report in HD. Also, it would be nice to have Comedy Central Presents and other stand-up specials in HD, i.e. Dane Cook's Vicious Circle. :up
BBC America is operated by Discovery, one of the few providers Dish has seems to have decent relations with. They just added Planet Green, which was not too long after its launch. They carry all their HDs, and are only missing FitTV and Investigation Discovery in SD (not the most popular of their channels)
Also, while I do say that I don't care if Comedy Central wants to show HD (although I still want the channel), that is not to say there would be no HD potentially available. A few new cameras, some new production equipment (maybe shared with sister networks), and some new graphics, and Stewart/Colbert both could be in HD. Same story with stand up specials (though I'm not looking foward to Dane Cook any format
