David Tennant has recently told What's on TV about Matt Smith, the fairly unknown actor who will take over Tennant's role as the Doctor during the regeneration in late 2009/early 2010.
He said, "We chatted on the phone not long ago and we did exchange a few opinions on what's about to unfold for him. But advice is a very dangerous thing. Matt's got an extraordinary journey coming up in all sorts of ways and I’m sure he'll find his own way through it."
"I could tell Matt was very up for it, though, and excited in all the right ways. He says he's going to take it very seriously and he seems to have the right idea about playing the Doctor, so far as I can tell."
Thanks to WhovianNet.co.uk for this news and information.