What are Nikon thinking?

I'm buying a D4 and have purchased the 24G and 85G in preparation. I'd really like a 50 or 60 but am stuck.

What's the best lens in this range? I love the idea of the 50mm 1.2 but I'm buying a D4, instead of a Leica, because I need speed. Manual focus will mean missing too many shots of fast moving things at my skill level.

Nikon's lens line up seems to have a hole in the middle. I know zooms are the popular choice but why isn't there a fast, pro, prime with nano-coating, aspherical elements and proper weather sealing?

Is something rumored to be coming down the pike?

Lens suggestions appreciated. I was thinking Sigma might be the answer...