Hmm, why? The biggest problem I see with this trailer is that I don't think the actress is a good fit. But I thought the same of Lena Headey at the start of the series.
And the stupid title of course. I'd have understood GeneSys or something, but the i ...
The Terminator franchise is one of the very few where reboots aren't a problem, in my opinion at least.
And the usual just-after-posting-edit:
I thought the franchise was dead after I had seen the first half hour or so of the fourth movie, when my friends and I decided watching the rest would be wasted time and walked out of the movie. Compaired to that this trailer is gold in my eyes.