He talks about the (four) steps that were taken to get everything unicode compliant, which resulted in :
1. A new compiler with new inherent UnicodeString type
2. A new RTL using new string type routines (i.e. many new compiler helper functions in System.pas).
3. An updated VCL using the new RTL that allows the string type to easily "float" to the UnicodeString type
4. A fully functional IDE compiling with the new Unicode Compiler, RTL, and VCL.
Looks like it is going to be a smooth shift...
Anyway one of the first things coming out for the new release and an interesting read!