The footage in the announcement trailer seems to be a match for the downgraded Vita version.
At 0:05 - 0:07 you'll see a boss fight from Sigma 1. If you compare it to footage of the fight on PS3 and Vita, it's clearly not PS3 Assets. Look at the environmental textures especially.
See PS3 @ 42:00 from comparison
A screenshot comparison:
The source code for NG/NG Black/NGII is lost, I assume the same is true for the original Ninja Gaiden Sigma.