There is an interesting (and very long) piece on the Microsoft Office development blog about the new touch interface in Office 2013.
There is certainly a lot of excitement involved:-
"We are excited about the opportunity to enable a whole new set of usage postures for Office, from the bus to the plane to the couch to the hallway."
Hands up anyone who hasn't secretly fantasised about reformatting spreadsheets in their hallway?
It will be interesting to see how this performs on the Microsoft Surface when it eventually surfaces (sorry), but looking at the screenshots of some of the UI elements my impression it that it looks fiddly.
As I have written before though, if Microsoft can deliver a really good Office experience on a tablet then it will be a big plus for enterprise users. Can anyone really see an iOS version of Office 2013 given the upcoming Surface launch?