I haven't had a chance to look into this specific case, but knowing the history it could either be a completely rewritten communications subsystem, or a WCF call is just a wrapper over the same old DCOM routines. OTOH, from what I've heard the whole TCP/IP stack has been rewritten, so hopefully these got the same treatment.
[OTOH, from what I’ve heard the whole TCP/IP stack has been rewritten, so hopefully these got the same treatment.]
A rewritten duck is still a duck.