In the Mobile section, the pros & cons of building an mobile editing solution was covered between ArcGIS Engine and ArcGIS Mobile.
The big announcement for Engine is that you will now have 2-way GDB replication support using ArcSDE for Microsoft's SQL Server Express.
Then a demo about the Mobile SDK for building and deploying a application for a Windows Mobile device. It's nice that after showing the demo application, he showed how it was built and showed the key parts of the code in Visual Studio.
And finally in this section, the new ArcGIS Mobile Editor was shown. This is a new out of the box application built by ESRI from the Mobile SDK.
Up next is Desktop (ArcMap, Engine and Explorer)...