The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
as per Cordell Chat (on montecook site) no 3.5 Psi handbook for now. But have you got Mindscape a psion guide ?, there is many changes in it .
and I really appreciated the Mindscape Combat ! (far better psi combat system IMO)