Introversion's game of Nuclear strategy is about to hit the PC on the 15th of June. Defcon will come with their previous title, Uplink, as part of a double-pack and has a lavishly designed manual to go with it.

More information including a trailer can be found at: http://www.defconvideogame.com/

And as a complete aside to this, you might think about getting one of these to prepare you for the coming strategy title:

http://www.thinkgeek.com/computing/accessories/9116/