There's a very short interview with Bryan Singer here at Newsarama (thanks to my friend Mosnokame for pointing this out to me). The most interesting bit, imho, concerned Lois and Superman's relationship.
Quote
NRAMA: After he gave up his powers in Superman II, Lois and Superman slept together. I’m going to assume that that’s when he got her pregnant...

BS: Possibly.

NRAMA: Then he gives her the kiss, which made her forget that they even slept together. Was the pregnancy a mystery for her?

BS: I ignored that part. I just assumed she remembered sleeping with him.
This is the first time I've heard this, officially. Am I just uninformed? <g>

Kaylle