I have no clue as to who Clara is. However, this episode provided us with plenty of clues (or red herrings) as to who she is. Guess it wouldn't hurt to compile them.

-Hopes to travel like the Clara from Asylum of the Daleks
-A nanny like Clara in The Snowmen
-Was able to hack into the internet after being uploaded to the cloud much like she was able to hack into the Dalek web after being converted.
-Favorite chapter of Amy's book, Summer Falls, is eleven. It makes her cry happy tears. (They are releasing an ebook of this on Thursday, I think.)
-Skipped the ages 16 and 23 in her book, 101 Places to See.
-The leaf in the book--101 Places to See--is "page one" of her life or something like that.

Anything else? Most insane theory I have so far is that she grows old and becomes Madame Kovarian, but I base that solely on the nanny stuff with no real reasoning behind it.