Yeah, I find it really hard to be excited about the trailers. It's not down to one aspect in particular (although it all looks too "crisp" for my liking), but it was mostly just... OK, and I think it's partly because I'm worried about the overall direction of the movie (which I'll get to in a bit).
The Han and Chewie scene didn't bring a tear to my eye, I have to say. It seemed like really obvious manipulation to me, and it's the sort of thing that's been done thousands of times before (not with Han and Chewie, obviously, but in various things). I feel bad for saying that; I certainly don't want to take a great moment away from anyone (but I don't think by saying that I will), but I'm just being honest about my reaction.
Overall, I'm worried about the overall set-up of the film. I really hope the Rebels aren't still fighting the Empire, having never beat them. I don't mind an EU-type set-up, with the former Rebel Alliance being in control of the galaxy, but with (large) pockets of Imperial resistance (so the tables are turned). Or, perhaps they defeated the Imperials, but now a new Imperial-style resurgence has appeared. Or some other set-up I haven't thought of. But to have the Rebels never having won, and still fighting the Galactic government? I realise that this may be realistic for a galaxy-wide conflict, but it's incredibly depressing, and harms the optimistic feeling to the original films (makes the Rebellion seem futile, especially the last push to defeat the Emperor). I really hope this isn't the set-up. Star Wars is cool because it's positive; too many movies/TV are grimdark; let's leave the "realism/pessimism" to other properties.
It's also a little depressing that Han is still wearing the same old outfit when he's 70 (I know it's not exactly the same, but it's very much the same style). It's certainly possible he might do this, but it's just a bit sad. It's like he's gone nowhere all this time. I don't want to see him with a pipe and slippers, but something a bit more dignified, something to show he'd moved on, perhaps? I hope that in the film he has moved on, and he dons a Rebellion-era outfit for a specific purpose. Let's hope it's that, rather than him never having changed (figuratively or literally).
So I guess I'm not worried about anything explicitly shown in the trailers, but about what it may all mean. I wonder if the proper trailer will assuage some of my fears.
I'm sure it will be a better film than the prequels, though.