Next generation DVD formats (both HD-DVD and BRD) will most certainly have DVI+HDCP outs at minimum and probably HDMI outs as well...
TEH BAD NEWZ
Its looking less and less likely you will ever see any HD-DVD/BRD device sold in the United States with Component video outs.....or at least, those devices won't pass a full-res 720/1080 image, thats for sure....
As you may or may not know, component video has enough bandwidth to pass HD images *BUT* (big but) it is un-encrypted...that is, you could, in theory, make duplicates of HD movies and possibly even distribute them over the internet......this is unexceptable in the eyes on the big Hollywood studios, so if you ever do see component video outs on HD-DVD/BRD players/recorders (and you probably will) it will most likely be a crippled version outputting 480p MAX...
This topic, as you all know, is a whole 'nuther can o worms with enough fodder for an entirely different thread, so I'll just leave it at that...
Japan is an intresting market as Japanese BRD-recorders have unencrypted component ins and outs to record HD terrestrial broadcasts @ full resolution.....there has got to be more to this, I would think...
At any rate, if you want to watch HD-DVD/BRD movies/games in full HD res, you will be viewing it via a DVI+HDCP or HDMI connector....or at least you will be in the United States...