SharePoint 2013 has a great new dialog that allows you to create a new office document online in a document library.
In a recent project I noticed that in a document library when I clicked the new document link a document upload dialog was appearing and not the new office document dialog.
After taking a look at the Library Settings, I noticed that in the Advanced Settings we had Allow Management of Content Types turned on. Since we weren’t managing any content types I turned it off.
And now the new office document dialog is available once again!