At present KGK exists as a playtest draft, written by Warwick and under testing with his group and my group. Its almost finished.
I cant at present give any publication details as frankly, we dont know ourselves yet. Warwick is hoping to have some firm idea when or even if, the supplement will get published in the next few months. Till he has sorted out that, we have no idea ourselves regarding publication dates.
As for KG 1940, KG Tobruk, KG Pacific and KG Germany '45, they too are all in various forms of development with some undergoing playtesting. None have as much work done on them as Kursk, but all have the army lists and statlines completed. Other lists are being worked on and though we dont know how these will be published either, we are using the time to develop and test as many lists as possible for future use.
So far the only list with a firm publication date is the British Airborne list that will be in the February issue of WI.