We asked Hasbro about this sort of thing way back on November 3rd, 2006...
ActionFigs.com: With Hasbro now producing 6" super articulated Marvel figures, could we eventually see a special line with 6" super articulated Star Wars figures?
Hasbro: We have no plans for this type of figure line. As the heart and soul of the Star Wars collecting world, we are focused on making sure our 3-3/4" line is vibrant, fresh, and exciting first and foremost, along with providing continued newness for our other play patterns (Star Wars Transformers, Unleashed 2", and Galactic Heroes).
Another outlet asked them about that idea a year later, on December 7th, 2007...
JediInsider.com: There seems to be a decent amount of interest from collectors for 6" Marvel Legends style Star Wars figures. What are the chances we might see a line like that in the future?
Hasbro: We will not be producing a line like this for Star Wars. When we have tried other collector-targeted scales (like 7" Unleashed) we found that fan interest, when compared to the 3-3/4" system, is just not as strong. In addition, for kids, the 3-3/4" scale is also the best one for a wide-range of figures and vehicles that play together, which is critical to the Star Wars fantasy. Rather than spread too thin against collectors, we will be focusing our efforts against making sure the 3-3/4" is broad, as we have been for the past couple of years. We should note that the other sublines - Galactic Heroes, Star Wars Transformers, and Unelashed 2", have a very strong following among kids and we will continue these going forward as well.
Surprisingly, that's essentially all I can find in the Q&A about the idea, aside from Hasbro reiterating that stance when discussing the 3 3/4" system's superiority.
Another site is rumoring that this line will be a co-venture with Gentle Giant, which isn't entirely surprising judging from the looks of the sample figure - the types of sculpting and paint remind me more of GG than of Hasbro.
Personally, I'm of a mixed feelings on this. I do like the 3.75" line for its ability to interact with vehicles and for a compact display, but vehicles have dried up in quality and Hasbro's collector-focused figures feel like they're peaked in quality, there were a lot of "ok" figures in 2012 that failed to be wows due to little things but also couldn't be failures, and at $10 a piece an "ok" figure just doesn't satisfy. I also like the look of that Luke pilot 6" figure far beyond the 3.75" figure.
All that said, Hasbro hasn't really earned $20 from me on this yet, that's a lot of coin for not a lot of product, and Hasbro is notorious at missing the boat on fine quality products, they always end up going with mass-market quality paint and production mold crispness. Figures at this scale also tend to be brittle in their joints, and Hasbro has not had good luck in that department either. Will a line of figures this large be able to justify its higher costs? Marvel Legends uses buck parts and simplistic sculpting on the bodies to get around that issue, it wouldn't be possible here obviously. Will this line's complexity cause a quick price skyrocketing, the way TVC did? Finally, my biggest complaint is Hasbro's distribution problems over the last few years, will we get enough figures to satiate, will they clog shelves, will the line budget overwhelm it and shut it down in its infancy?
I do want Hasbro to be able to recapture the collector market, they tried to do so with TVC and it was met with mixed results, I don't want to invest in a new line of figures only to find partway through that it's coming up short and dead without major characters. That doesn't mean I'm out, but it does mean I'm cautious to my feelings on this matter.