The long term plan (likely by 2020) will continue to be all CRJs transferred to PSA, replaced by E-175s. Speed is based on delivery of E-175s, training capacity at Envoy, and recruitment and training capacity at PSA.

There are further plans to replace some more of the E-140/145s with E-175s. I don’t know how many or the timing; just after all the CRJs are transfered.

My source is one of the highest training pilots with Envoy.