So far I've been underwhelmed with the licensing announcements. I'll watch Emma but I won't be rushing out to buy it. I prefer hetero romance animes and so far the only ones that I like from RightStuf have been To Heart and, to a lesser degree, Emma.
There is absolutely no requirement to be into "yuri" to enjoy Marimite. It stands completely on its own as a melodrama with a good dose of humor.
I'm still waiting for a company to license Da Capo and Da Capo ~ Second Season. They've just finished up the FOURTH series in Japan (Da Capo II ~ Second Season) and NONE have been licensed as of yet.
Anyway, I like all of the shows you've mentioned. And I LOVE
Aria, so you really ought to check that out (the price is certainly friendly enough). If you like the relaxing pace of Emma and To Heart, Aria takes it a step farther. Extremely worthwhile, and after I finished Origination, it's just simply one of my favorite franchises.
As for this license (or two, going by the comments in the weekly special threads) I have no idea. But god I wish it were the 4th so I could find out.