You can also connect through LCY and LGW, but again neither is likely to happen.
In Stobarts press release regarding the Southend service they mentioned the presence of Easyjet at the airport, suggesting that connections on to the Easyjet network may be offered. However this would go against Easyjets model, and I doubt the 2x daily schedule will connect well with most of the destinations offered, so I can't see that happening either.