In regards to the CGI, check out the comparison in this article to see how post-production is an ongoing thing, even as trailers are coming out.
http://www.wired.com/2015/02/new-jur...i-plain-sight/
Looking at how backgrounds etc. are being altered, it does make me a bit concerned as to how heavily this film relies on animation.
However, Stan Winston Studio, who did the animatronic dinos for the first couple films are returning, which is encouraging. Our old favourites, including T-Rex should be kept JP1 legit. By the way, they have their own youtube channel. The vids are pretty fascinating and worth the watch: