Esri posts semi-secret summaries regarding the various technologies or concept ideas for attending the Esri User Conference in-person. These comprehensive session overviews at Esri User Conference can help you focus your attendance. All topics, currently available (more will be released soon) can be found in: Conference Documents (Also, look/follow Esri on Linkedin, Twitter, etc. the Esri staff sometimes posts these kinds of documents & helpful tips too.)
Topics I would like to highlight (due to my own personal interest*):
One helpful thing I noticed this year, was some of these documents included a MAP of the Exhibit Hall, which includes the Demo Theaters! (For those who attended the eGIS Brown Bag, we talked about the Demo Theaters being essential to learning the technical products by directly connecting with the developers. aka where you get their direct emails, so you can ask specific questions about products and workflows.)
Happy GIS-ing!