Most of the laminations I have done will within reason, retain the
shape they are set to when glued together. I have done laminations
where as the individual plies are NOT steam bent, and then glued in an
arc around a form. Once the glue dries the lamination holds the shape
of the form with zero or very little spring back. I would imagine you
could get some spring back if the lamination is highly stressed, that
is you are bending the hell out of the wood.

Good luck
Doug