Sorry JCR

- but your quote from the Radio Times is actually David Tennant NOT RTD and unfortunately you missed bits out that some others might be interested in especially those from other countries - suggest you have another look please !!
The quote is actually IN FULL ...
"Next week, we have the read-through for the next episode back in Cardiff" says Tennant "which will go out ... well some time towards the end of the year. That story really is the beginning of the end, but Planet of the Dead could kind of exist anywhere in the Doctor's lifespan.
There's a little hint at the end of what's to come - an omen - but this is an unhibited romp.
When we start on the next script you can sense the bell tolling for the Tenth Doctor. Something happs in that one that fundamentally alters who the Doctor is and where he is, which is the sort of thing you can only do when you're coming to the end. That's very exciting and quite sad. This Easter episode is, I suppose, the last hurrah for my Doctor.
The end is nigh. You can sense the Grim Reaper knocking on the door. But, " he concludes cryptically, "how many times ?"