Michael, you seem to have confused some of the facts.
The Solaris Express release will function as the previous Solaris Express, a preview of the future of Solaris, and as such it will not be released after the enterprise Solaris release. What will be released after the enterprise release is the code for it, akin to what Apple is doing with Darwin. There will be no replacement for the OpenSolaris distribution as apparently Oracle sees no use for it., their Solaris code-base will be developed behind closed-doors, and only after the enterprise Solaris release will there be a "Solaris Express" release intended as the replacement to OpenSolaris.
This is the sequence:
1: Solaris Express builds preview the current development stage; no new code is released
2: The official Solaris release eventually gets an update; no new code is released
3: Code is released under the CDDL at some undetermined point later on
I'm not defending what Oracle is doing - I just think we should all strive to get the facts right.