I don't think so - just back references to remind people a) what happened to Torchwood, and b) as a standard point of reference for serious shit.
Decent start, and I wonder whether whatever's happening is aimed at the human race in general or at Jack in particular, with everyone else's apparent immortality simply being a side effect. Alternatively, the culprits might be whoever constructed the immortality gloves from the first two series.
And this (3:10)
is why you shouldn't conflate English and British.