If you have a look at the TechNet SharePoint 2013 Preview articles, you'll see that Microsoft has done a great job of documenting a lot of the cool new features in 2013. The first paragraph briefly describes an improvement to the Word cut and paste experience for content authors. I can't say enough how important I see that being, so I've devoted a full post just to that topic at SharePoint 2013 Word Cut and Paste.
Naturally I was keen to try the feature out, so one of the first things I did was open my new 2013 blog site (which still looked like 2010), and paste some rich text in from Word. Boy was I disappointed to see that it didn't work. What I didn't realize is that I had to complete the site collection upgrade to be able to see the new feature (yes 2010 mode really does work like 2010).
It was now time to try the Site Collection Upgrade. Much like in 2010, in the Site Collection Administration section of Site Settings, there is a Site collection upgrade option. Running this goes through the site collection upgrade, and another log file is generated. I still had missing features for some of our products that I hadn't tested the upgrade on yet, but otherwise the upgrade went well.
Again like 2010, the resulting site worked but looked all wrong, for the same reasons. The upgrade had changed the master page reference to a new v15.master page, that didn't have any of my custom branding on it. It was time to figure out Design Masters, which are the new way of doing master pages in 2013. ...