The deal will be announced shortly. It's been confirmed by our friends at AllThingsD.
It will be interesting to see what happens to the Linux and Android versions of Skype under Microsoft's control. The Skype Linux client itself isn't too great at the moment compared to the Mac OS X and Windows clients, but if the quality suffers even more, it will be a loss to the many Skype users. Skype is also available for iOS and Mac OS X, but it's unlikely to see Microsoft canning those extremely popular ports.
More information later. At UDS Budapest right now in the middle of benchmarking and X.Org talks.