Valve has today released a new trailer for the upcoming hit FPS series, Counter-Strike: Global Offensive, which features the two main protagonists - Counter-Terrorists and Terrorists. What is interesting about this trailer is that it is actually developed in the recently released Source Filmmaker, meaning that it features real-time models instead of CGI.

In other Counter-Strike: Global Offensive news, it seems the latest title won't be launching alone next week, with a recent blog post detailing a new zombie mode that will offer players the chance to relive the very classic mode from Counter-Strike: Source.

CS:GO doesn’t launch alone next week. When we go live next Tuesday, we will have some brain chomping walking dead joining us. The guys over at plaguefest.com have been working with us to get Zombie Mod working on CS:GO and it’s ready!

It was important to us as we developed CS:GO to make sure it was as moddable and extensible as any CS game. So this is just one of many mods that will be available to CS:GO in the coming months.

So make sure you check out the trailer below (HD over here) detailing the ever-waging war between the two factions, and keep an eye on Tuesday 21st of August for the release of Counter-Strike: Global Offensive.