Sony approved Koei's Soldnerschild S some time ago, but by the time the game's developer got the thumbs up, it had already begun serious work on Destrega (due for release at the end of next month) and WinBack (due out this fall). As a result, development on Soldnerschild S has been delayed, and its future release date is unknown.
We'll have to wait to see if and when the game is actually released. On a more optimistic note, Romance of the Three Kingdoms 6 will hopefully have an end-of-year release.