In anticipation of Star Trek: Into Darkness, Hasbro via their Kre-O line has already released multiple building block sets - as well as a series of Blind Bagged minifigures!
Each package has a unique set of two numbers on the back upper right of the package, which leads with '30711' on all of them.
The Klingon was 30711 08 and Gorn was 30711 09. Or maybe it was the other way around, I got the packages mixed up when I opened them. Regardless, you will be able to tell because Gorn has those massive legs, and their weapons are unique too. So you might have to squeeze a little bit, but not too much ;)