The email on his first day is an interesting read:
http://www.microsoft.com/en-us/news/press/2014/feb14/02-04ma...
He introduces himself, explains about his way of thinking, tells about his family, for example
It's something MS needs. A fresh departure from Ray Ozzie, who looked like said Good Morning to his wife with a Corporate Memo, or from Ballmer, who, although energetic, didn't have a good aim for things (well, to be fair it's difficult to throw chairs with precision)
Still a bit less buzzwordy than Ballmer.
Microsoft already produce some apps for the web, iOS and Android, and Azure can run Linux VMs.
Hopefully they just go wherever people want to pay them, eg, to access MS Office where they need it, even if it isn't via a Windows device.
Anyway good luck be with him - from what I read in his bio he was heading the only part of MS recently that managed to not alienate its customer and developer base.
In the next few weeks, the new CEO will be solidifying everything with Q&As, visiting the various campuses, and announce any new org changes. Org changes will be the big thing that impacts what individual contributors actually do in their jobs. Major changes to the 2014 strategy or goals would be announced soon, but seeing as how it's mid Q1 it's probably going to be changes for Q2 or 2H.