This trailer is mixed.

1. The beginning shows something that looked interesting and good. The chase scene with Twilight and Sunset Shimmer is very intriguing and action-packed, yet suspenseful.
   
2. The moments Twilight behaves in the alternate dimension (running on all fours) is funny and shows how she hadn't adopted to the dimension.
   
3. On the other hand, so much information is crammed in, particularly after Twilight and that son of a bitch, Spike, land in the dimension. We know that the only way to "genuinely" retrieve her crown will be to be the "princess" of the Fall Formal (a.k.a., a "prom"). That's a very key point in the plot, and the dresses offer a key clue how she may get it. Like what I wrote before, if you really want to wet people's whistles, be simple, graphic, and to the point, like
   for Sonic Unleashed. Too much information makes the movie overwhelming and shows less respect for EQG (and the main series itself) as a whole.
   
4. The animation of the humans sucks. The walk cycle looks stilted, the squash-and-stretch effect to make the animation nice and fluid is absent, and the lip movement is stiff. In FIM, the ponies move organically and look like something from a handdrawn Disney movie. Here, you can easily tell that DHX used Flash, but used it in such a way as if to cut corners instead of treating it as a respectable animation program/enhancer.
   

This trailer is a mildly better one, because some parts are funny and demonstrate a better ability to attain interest. However, it still crams in too much info, especially in the second half. It's even more unfortunate that this wasn't the first trailer, because the first trailer was an info-dump that spilled so many key points, while this one shows a tad more, yet still tells me to have faith in it instead of showing me they have faith (although not to such an extent as the first trailer).

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Source: New Equestria Girls Trailer