|SharePoint 2013 Team Site in Office 365 is a major change in UI, making a more tablet friendly simply design|
|SharePoint 2010 Team Site has most of the same features as the 2013 site, but is fully grounded in the PC world or mouse clicks. Imagine trying to manage this thing with a finger.|
|SharePoint 2007, while the UI changes between SharePoint 2007 and 2010 were in large part cosmetic, SharePoint 2013 is a real change in how people will be able to interact with SharePoint.|
Microsoft is embracing disruptive web technology from places like Google, Twitter, Facebook and the start-up culture of open interfaces. Things are going to change a great deal, SharePoint silo nature may change for something more like Twitter.