Both!!!!

But it really depends more on content. What I really want is the immediate post-
ROTJ trilogy (following the novels or otherwise; I'm about to read the
Thrawn series and I'm curious whether they'd be the best basis for the story).
Recasting the principles a la
Star Trek is fine with me, taking into account the pitfalls of attemping such a thing. But if they could successfully recast Spock, one of the most iconic characters of all time, then even Han should be do-able.
If movies are the best format for this story (relatively short, lots of visuals/action) then movies it is. But if it's TV-worthy (longer and more complicated, maybe bringing in the next generation, more talking, character development and complex plotting vs. visuals/action) then TV is the way to go.
The knee-jerk answer for
Star Wars is always movies, but if the story tries to deal with Dark Side threats to either Luke or Leia, TV might be the better medium, because to pull something like that off convincingly would require some fancy writing. They both seem to have strong defenses in their personalities - Luke is too pure of heart and Leia is too practical and savvy to be easy Dark Side prey. Ideally, you could build that storyline over years and have a chance to sell it to the audience that way. Ditto for complex and believable political or mystical themes. A post-
ROTJ saga with the depth of
DS9 would be my absolute dream come true.
Lucas has put his live action Star Wars series on hold due to the difficulty of doing episodes at a tenth of the cost.
That's a sure sign that we dodged a bullet. Ron Moore did a fine job with
BSG on what is almost certainly a smaller budget than Lucas would have to play with. I don't want a
Star Wars series on TV that's going to depend wholly on action and battles. Good character writing and plotting is not expensive, but clearly Lucas isn't even thinking in those terms. The TV medium can do character and plotting better than movies - that's its strength - so anything written for TV must be written for its strengths, not as a cheap and dragged out type of movie.
A live action SW series should be a half dozen episodes with a self-contained story, not a 12-20 episode/year series with an indefinite run.
The TV biz is hostile to the miniseries format nowadays. Not exactly sure why, but probably because you need to amortize the start-up costs of a new production by extending it over as many episodes as possible.
I don't think anyone should assume
Star Wars on TV is an automatic money maker. If that's true, then why isn't there a new
Star Trek series being planned in the wake of the movie's big success? TV and movies are two very different businesses, and I hate to say it, but CBS is right not to assume that
Star Trek would do any better on TV now just because the movie did great.
Anyway, if you're just going to do 12 hours, why not telescope it to 6 hours, throw a big movie budget behind it, and turn it into a movie trilogy? If you really need 12 hours, make it two trilogies.
With 12 hours, you lose the strength of TV - that you can tell a grand, epic story, yet with sophistication and complexity, that spans a hundred or more hours of storytelling. The reverse philosophy, where the story is relatively short and uncomplex, belongs on the big screen.
But you know Lucas got it in his head making prequels, "Hey, we could do an entire series using virtual sets and virtual props and no-name actors and computer generated aliens and within 5-10 years it will cost next to NOTHING to produce!".
I think that could work in theory. But with the PT Lucas has demonstrated that he is not the guy to pull it off anymore. It needs someone who knows how to cast those unknowns very well (once upon a time, Mark, Carrie and Harrison were unknowns, too

) and write a heck of a story.