The last I heard, it was likely to be Topher Grace as Jimmy Olson and Mischa Barton as Lois Lane. I'm thankful it's not though. I can handle Ashmore as Lane. He visually fits the part.
And, yes, Superman does come back after being killed by Doomsday, but it's still too early to kill him off in a movie or introduce the character that does the deed. You need to establish some of the traditional storyline first.