[jboss-as7-dev] What is AS 7 kernel ?

[developer251 at libero.it]

Dear JBoss developers,
I'm interested to learn more about the release 7 of the application server. 
The most basic question is: does JBoss 7 has a completely new kernel 
architecture ?
I cannot see traces of Microcontainer in logs, rather :

14:59:45,906 INFO  [org.jboss.modules] JBoss Modules version 1.0.0.Beta16
14:59:47,375 INFO  [org.jboss.msc] JBoss MSC version 1.0.0.Beta7

Is there any thread/link which discusses a bit about this ?
thanks a lot
Paul