Different. 1st morning session is primarily Jack where talks broadly about GIS, ESRI, and touches on what's new. 2nd morning session after the short break is where ESRI demos/announces the new enhancements across the ArcGIS platform but also live demos some of what Jack may have mentioned.
The first afternoon session after the lunch break is usually some sort of show & tell of GIS technology applied along with some example of K-12 graders use of GIS. The last afternoon session would be the actually keynote speaker's presentation. After that, the map gallery opens & everyone heads up there.
You can get a taste of this by going to ESRI's YouTube channel and looking at the plenary videos for either of the last 2 UCs. Although they were virtual, the content delivered is pretty much in the same manner as what is presented at the in person UCs.