Eurogamer had the profit at $2.5B, not $5B, still not bad!
Hmm, yeah I see their story says 257 billion yen profit ($2.5B), over at n-europe.com where I got the news it says 487 billion yen profit ($5B). Both show the same sales value though of 1670 billion yen.
I'll hunt around to see if any other major sites can confirm which it is!
Edit: Gamespot also confirms it at $2.5 Billion! Still, amazing!