Nokia's CEO's Stephe Elop has released a statement regarding the arrival of Windows Phone 8 and the special ties of cooperation between Nokia and Microsoft.These statements have triggered a series of speculations, including the last in order of time makes reference to a possible period of exclusivity granted to Nokia for the sale of the Lumia WP8 smartphones.Let's quickly review the interesting prospect that, at present, must be regarded simply as a hypothesis, not corroborated by any official figures.