Dont know if this will last long but here goes...
With Doctor Who split into 2 halves this year, they're abandoning the usual volume releases and doing two half series sets, the first of which will be out in July.
Strangely, Amazon are currently selling the blu ray for part 1 cheaper than the DVD! (which is £18.70)
So there's the first 7 episodes up until the mid-series cliffhanger to whet your appetite with in glorious HD!