The Build 2014 conference was recently held in San Francisco.   See http://www.buildwindows.com/ for links to all the key note and session videos.

Our very own Beth Massi gave a talk about Cloud Business Apps.  In her session she builds a survey application from beginning to end.  This includes the design of the data, integrating with SAP, modifying the UI using CSS, integrating with a SharePoint newsfeed and publishing the application.   The overall all architecture of Cloud Business Apps is shown as well. 

Check it out: Developing Office 365 Cloud Business Apps