Well, the way Sting does ports, it can't be all that easy.
Check the
LCN games page for what's new in each Dept. Heaven remake. Adding that stuff (for the PSP remakes) couldn't have been easy.
I don't think we yet know if they are going the quick and dirty or comprehensive route for this remake. I personally don't care either way as long as the price is inline with quality of the finished product.