I had not realized until very recently, after reading a blog on gamasutra.com, that you could publish your Steam store page live before actually having the game ready to go live. A rookie mistake by me, but means my constant reading of other developers blogs pays off sometimes!
So here is it – Battle for Korsun store page live on Steam.
It still needs some work, like the store descriptions being translated into the languages I am going to support, but I hope it will help generate interest in the game prior to launch.