"Jenny" Returns? *Possible Spoiler
I don't know if this has been discussed (because I haven't gone in the spoiler topic) but an actress by the name of Catrin Stewart has been cast as "Jenny" for the mid-season finale.
I wrote about it in my blog here:
Here's a piece of what I said:
Georgina Moffet, the actress who played Jenny in "The Doctor's Daughter", is due to give birth very soon so this could be a recasting due to her not being available or a regeneration for the character who was technically a Timelord.
At the end of "The Doctor's Daughter" Jenny is shot and thought to be killed although we see her in the closing moments awaken and run off to experience her own adventures. We know that a Timelord can use the re sidual regeneration energy to regrow limbs or in this case, heal. The Doctor states this is a possibility for the first 24 hours (Christmas Invasion) and Jenny was definitely within that time of her being "born".