Rewatching series 5 knowing who River is *spoiler*

[DWF]

I think Moffat knew, hence the random Doctor quote to Amy "when is a [duck] Pond, not a Pond?" well I think the answer to that would be "When it's a River"

When did he say that? In The Eleventh Hour he said: "Why are there no ducks in the duck pond."

 

[G2309]

I've just watched the big bang and was wondering if anyone knew when Moffat had decided who the River character was.
I had hoped he'd decided beginning of season 5 but watching the big bang makes me doubt it
She says to Rory "I dated a nestene duplicate once. Swappable head. Did keep things fresh."

Hardly something you'd expect her to say to her parents.

Moffat has mentioned on a couple of occasions that when he was unsure whether Alex Kingston would commit to a recurring role in the series and in order to persuade her he told her River's entire storyline.

Thanks I tend to watch most confidentials and read some interviews but hadn't heard it mentioned. I'm glad he's planned it as I thought he had well in advance.