Actually "Han Solo and the Princess", the Han/Leia love theme.
Indeed.
"Leia's Theme" was from ANH and something entirely different
I stand corrected. For some reason I had it in my head that the 'Love Theme' in ESB reprised some of the melody from 'Leia's Theme' in ANH. Listening to them both now it's clear they're distinct tunes. Similar, but clearly distinguishable and yeah, it's the theme from Empire that they're using in the trailer (a version of it at least.)
Still, the point remains valid. Han/Leia theme = heroes, Luke's Theme = villains.
I'm not saying this is by any means proof of anything plot-wise, but it's clearly a deliberate choice meant to evoke something very specific for whatever end.
Yes, it's CLEARLY a deliberate choice, in the sense that JJ and Williams didn't put the names of the various SW themes on a wall and throw darts randomly at them.
You're reading into it too much that it was "meant to evoke something very specific for whatever end", other than being the right piece of music to match the tone of the images.
I see this a lot with fanboys - they tend to overthink things to the point of absurdity, the result being that THEY themselves put more thought into the subject at hand than the actual film makers/tv makers do. "Lost" was the ultimate example of this - the theories making the rounds were SO convoluted and detailed that there was NO WAY they were going to be true!
Just relax and enjoy the images and music.