Well its the only article on mobil.se from the last couple of days that claims anything like it. Its almost exacty the same as the mynokiablog article but they twisted the headline some: "Windows mobile from Nokia in september"

Edit: Google translate of article:
Ordered by subcontractor
"Windows Mobile from Nokia in September"
Nokia should have placed an order on the hardware for its first Windows Mobile by a contract manufacturer with sales planned to start in September, according to unconfirmed reports.
Writer: Henry Thoresson
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Nokia may be able to get its first Windows Mobile on the market innnan starting to sell mobile MeeGo-N9. According to Taiwanese media, Nokia has placed an order for a phone that will be manufactured in two million copies. and where the first delivery is due in September.

Earlier this summer spreading a film on the net where Stephen Elop revealed an upcoming Windows Mobile for Nokia employees. The model, which has become known as Sea Ray, looked to be almost identical to Nokia's MeeGo mobile N9. The only differences that could be discerned was a slightly different placement of kamneran on the back and some differences in how the keys were placed.

If it really is the N9-type model which will be the first among Nokia's Windows mobile devices can not say with certainty, even if it gets it, or a Windows Mobile that reach customers first. But Nokia has selling points that you've learned a lot when they have developed N9 and probably have seen that production of the N9 is in an earlier phase in order to bring their experience with Sea Ray to begin serial production.