I've been going through the original series first season in HD. Looks so pretty I can see the makeup lines around Spock's ears 
Too bad they likely will never release the next two seasons in HD, especially since the second one was almost ready to print when HD-DVD got canned 
I think they've got all three remastered seasons on DVD, so I can't imagine they won't have them on BluRay soon enough.
Yeah, except that Toshiba was funding the HD restoration. Unless another company picks that up, BR release seems more and more unlikely each day. Season 2 remastered has already come out on DVD, no word for a Blul release, and Season 2 and 3 aren't even shown in HD on TV right now. The masters were cleaned up, so there is still hope. Might be a ways away though.
edit: I think the main problem is the massive amount of content. Season 1 is 30 episodes at over 50 minutes a pop. Although it has a huge fanbase, there have been a lot of reprinting of the original ST episodes. So the price can only be so much, even though there is a LOT of content to remaster. The HD-DVD set comes on 10 discs, so that adds to the cost as well. I think a lot of companies see that project as a big cost with limited return, unless Paramount covers the cost themselves. So far they've been unwilling to do so.