*SPOILERS*

My answer contains major spoilers!

The BBC has confirmed it, and from what I've read, I think she can pull it off. Her character must be good, she's going to be there for the 50th anniversary! She's going to start in the क्रिस्मस special, which will be after the first 6 episodes ("Amy & Rory will leave in a final encounter with the Weeping एंन्जल्स in ep 5. Not everyone gets out alive and I mean it this time" according to Steven Moffat on the official Doctor Who Twitter account) then she'll be in the remaining 8 after, and maybe for another season.

Steven Moffat has कहा this about her:
"We saw a lot of brilliant actresses. But Jenna was the only person going faster than Matt - he had to keep up!"


Jenna herself has कहा this, through the official Doctor Who Twitter account:
"I want to get started already. I'm a huge प्रशंसक of the show."

And this:
"Matt Smith did my audition with me. It was fun and I felt like we were in it together."

When she was asked about her प्रिय companion, Jenna said:
"Between Billie Piper & Karen Gillan."

This series is going to have two parts again, like series 6. Part 1 will be in fall, with six episodes (Amy and Rory will leave in 5, so the Doctor is probably alone in 6, या revisiting someone like Craig), and then there will be the क्रिस्मस special in winter where we meet Jenna's character, and then part 2 will be in spring with 8 episodes. With 14 episodes not including the क्रिस्मस special, we have an extra episode this year! :D

Steven Moffat and Jenna are in the picture below...

I'm sure she'll be fine. I've watched most of the episodes from '63 through the new series. Some companions take a while to warm up to, others click right away. It's all in the writing.