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I did hear last week that its the back end of next year for the Tristar now but an unconfirmed rumour.
UK MoD reviews retirement plans for RAF transports, tankers
Use of the TriStar will continue beyond a planned July 2013 end date until March 2014, for an additional cost of £7 million, the NAO says. This would be just two months before the AirTanker consortium is scheduled to declare full capability with a new fleet of Airbus A330 Voyagers, three of which are already in use in the passenger transport role. Release to service approval for the incoming type to begin in-flight refuelling activities is "imminent", AirTanker says.
The imminent is still rolling but they've changed 'their baskets' that didnt work for 'our' baskets that did (apparently - according to a reliable source).
VC10 exit September 2013 ish -