Apparently, Bloomberg thinks Satya Nadella who is currently pushing Microsoft's Enterprise Cloud service is MS's a good bet right now.

http://www.bloomberg.com/news/2014-0...della-ceo.html

Him being in the business for a long long time and him being in charge of enterprise and business related departments is a good thing i think. means he might look at the Windows OS and a business tool and bring it back in line with Win7.
Though I wouldn't be sure where the hardware divisions, such as tablets and consoles, would stand.