Lego are great these days at collaborating with movies and games to produce cool and interesting new sets. Some of the ideas come through the Lego Cuusoo site, this is where a designer puts their project idea so that it can be voted on by visitors and if it gets enough support, it will be made! Cave Johnson would be very proud!
According to the project listing on the LEGO CUUSOO site, this is what you would be getting in the Lego Portal 2 set;
Includes three mini figures, Chell, Wheatley, and the famous potato.
Features battle platform, portal gun, and GLaDOS
GLaDOS can swing a full 360 degrees and is able to rotate her head in all directions
Perform a core transfer with Wheatley and GLaDOS!
Battle platform is over 5″ (15cm) long
GLaDOS is over 9″ (22cm) wide, and over 12″ (30cm) high
Parts count: 499+
Source [Nerd Approved]