The new departure routes I think are DOKEN SIDs which end next to MID, they are P-RNAV routes which means that more aircraft can be packed closer together, it doesn't mean an increase of traffic on any route, just that the integration of departures and arrivals between all the London TMA airfields can be conducted rather more efficiently.
I would be wary of complaining about them, Gatwick residents may suffer the wrath of this in a few years time......