After watching Rampage again I did some research and turns out there's a sequel in the works, starring the same main actor.
I doubt it'll be as good as the first one but I'm definitely gonna see it.
Rampage 2 (2014)
http://www.imdb.com/title/tt3448226/
"A man takes over a TV station and holds a number of hostages as a political platform to awaken humanity, instead of money."
For those who don't know Rampage:
http://www.imdb.com/title/tt1337057/
"A man with a thirst for revenge builds a full body armor from Kevlar and goes on a killing spree."