We don't have any concrete plan to support OCSP in grpc core.
One plan we have is to support handshaker model, where there is a handshaker server that does all the SSL work (key management, revocation, rotation, handshake, session resumption and caching, and so on). gRPC just needs to implement a thin handshaker client that talks to the handshaker server. In that scenario, OCSP support goes into handshaker server, rather than gRPC code.