I saw it. So far, wayyyy better than the last anime.
Right off the bat, it seems like it's gonna be less childish. Not so many of the cutesy chibi'ness the last anime liked to overuse. You know the ones… like in the eyecatches and ending.
BGM seems to be completely new. That is to say I didn't notice any of the old BGM... not even the ol' FT theme.
Animation isn't anything special, but the art looks a lil' more detailed and more like the manga. Just better shading and what-not.
Viola! Natsu's fire actually looks like fire now! Glad they changed that.
I think I noticed some blood when Sting one-shotted the Sabertooth Master... which would be cool, as the original anime had no blood whatsoever (except for in the movie and various OVA's).
The beginning kinda flash-forwards to where Natsu is already fighting the dragons, but it goes to where the original anime left off once the opening plays.
So... not a bad return. Looks like they're trying to make it more mature and not as childish, although it's still very much FT. I will miss the original BGM, but we'll see where the new one takes us.