$710 for 17mm f/1.8? Crazy overpriced

Two things: 1) it's a rumor site. 2) just because the lens wasn't announced doesn't mean it doesn't (or won't) exist.

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"If you simplify your English, you are freed from the worst follies of orthodoxy. You cannot speak any of the necessary dialects, and when you make a stupid remark its stupidity will be obvious, even to yourself." - George Orwell "Politics and the English Language"
"Unfortunately, in digital photography a lot of people are seeing pixels, not photographs ... Everyone together now: it's not the pixels. Sing it with me." - Thom Hogan
"If you pick up a camera with any sort of serious intent, you will at least occasionally need to use a flash. Done deal. Lock solid, Take it to the bank." - Joe McNally