Ok guys, I'll tell you what I recently knew about this proyect. I will not give any information about the source though, so you can take it or not as valid information:
Lords of Shadow was far into developement at the moment Konami took interest on it: originally it was not a Castlevania game.
There was another Castlevania game in developement, this game was cancelled or indefinitely postponed. Chances are that this game was Igarashi's (but this is something i really don't know for sure).
The Kojima implication in the developement/production process of LoS has been almost unexistant up to the present moment, as far as I know.