Matt Smith has been very vocal about taking each year of Doctor Who as it comes. He's not one to make guarantees about his future on the series, stating that as long as he's enjoying the work, he'll continue. There had even been some murmurings that Smith would be leaving the show at the end of the seventh series, sparked by an out-of-context quote that he had "one more year left."
Fans need worry not. The Eleventh Doctor, it seems, will prevail into series 8. “[I'll be on the show] forever. 50 years. I’m loving making it," Smith confirmed in an interview. It's hyperbole, naturally, but also indicative of his mindset. “I think we’ve got one of our strongest seasons yet coming up. I really do. We go into the 50th year all guns blazing. And I’ll be around. So…that’s it, really.”
It looks as though Smith had been uncertain about continuing for long past the departure of fellow series regulars Karen Gillan and Arthur Darvill, but now it appears that working with new companion Jenna-Louise Coleman has changed his mind.
Of course, his continued presence also depends on Steven Moffat, who appears to be setting up the Eleventh Doctor's endgame with his "Fields of Trenzalore" storyline. If he does get to continue on through an eighth series, Smith will have portrayed the Doctor in more episodes than any Doctor since the show's 2005 revival. Here's hoping that's the case.
Doctor Who will return in the fall for its seventh series.