Where to get 2.5

I was wondering is 2.5 up for playtest yet? Or is the latest version still 2.1 for general use? I've been thinking about runnign this for my group but wanted to play with the most current version so that if there were any observations or issues they woudl be relevant and not already fixed.

2.5 only exists in the Colonial Marines playset.

Which is here: http://mightyatom.blogspot.com/2013/02/the-regiment-colonial-marines-25.html