Windows Phone Series to Debut in MWC 2010?

Will we be seeing a series of Windows Phone OS instead of just one (i.e. Windows Mobile 7)? It seems that (with evidence) there will be more than one Windows Phone OS to be announced.

Kudos to Engadget. When they are there at MWC 2010 site, they saw a sign that says “Windows Phone XXXXX”. They will speculating that the word that is being covered up might be Seven. It sounds logical. However, they took a step further by using Photoshop to uncover the word.

Engadget succeeded in revealing this word and now we will be scratching our head on why Microsoft choose the words “Windows Phone Series”. Could it be like previously, “Windows Mobile Standard” and “Professional” edition? Or could it be another ball game? We will need to wait just a few days for this answer.
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