I'm not quite sure how to feel about this. I'm a bit eager to put the awful prequels behind us and see what a continuation of the original trilogy without George Lucas' meddling might look like, but I'm not sure I can really form an opinion until we get past the teaser stage and start to see some real trailers.
The black stormtrooper seemed a bit out of place. Not that I have a problem with the idea of black stormtroopers, but I thought the prequels clearly established that all stormtroopers were clones of Jango Fett, who is not black. I suppose it's always possible that someone was wearing a stormtrooper's outfit as a disguise, much like Luke and Han did in the first film.
The villain's lightsaber has crossguards like a longsword, which may look sort of silly but probably comes in quite handy in a fight against someone with a normal lightsaber.
That speeder looks interesting, and Daisy Ridley looks pretty adorable riding it. ( She's rumored to play Han and Leia's daughter, but I guess we won't know for sure until sometime in 2015. )
It sure was nice to see the Millenium Falcon again and to hear John Williams' wonderful score, which is probably the best thing I can say about the teaser so far.