Despite the termination of the merger between Cityjet and Stobart, I wouldn't be at all surprised if Cityjet appear with a Sukhoi Superjet 100, operated on behalf of Stobart.
Cityjet has said that they will sign additional airlines for further white label operations. They have plenty coming on steam, and the aircraft won't be going into LCY this side of 2018, they currently have 3 with more to follow this year, if I recall rightly.
EI-BUD