Principate
Saint Titanfall
Highly doubtful.
These are the guys who created Demons Souls, on both sides, so they will naturally build a new engine that has the same overall weight and feel of the original product, especially when it is done on purpose as homage to the work they did before.
I think this is a completely new engine that From will likely use throughout the generation. With obvious homages to Demons Souls
Well they certainly wholesale took the rag doll physics... Christ.