Architectural difference between 11i and R12

Hello Guys:
I am planning do a training in Oracle Apps very soon. We are running 11.5.10 CU2 and for the most part it won't be upgraded to R12 in at least next 1 year. Now that the R12 is released Oracle has more of R12 trainings than 11i. Given this situation I am in a dilemma has to which version I should be doing the training. 11i or R12.
I firmly believe that unless otherwise there is a huge change in Application Architecture I should go with R12. I went through some of the R12 release notes and to me it looks there is not much of a difference in Architecture between 11i and R12. Do you think my decision to do R12 is wise?
Hussein , your thoughts on this?
Regards,
Bala

I went through some of the R12 release notes and to me it looks there is not much of a difference in Architecture between 11i and R12. "Oracle Applications Concepts - R12" manual lists all the new changes/components in Oracle E-Business Suite R12 on the Application, Database, and Desktop tiers.
Oracle Applications Concepts
http://download.oracle.com/docs/cd/B40089_09/current/acrobat/120oacg.pdf
Become Oracle Apps DBA - Difference between Oracle Apps 11i and R12 (Technical)
http://becomeappsdba.blogspot.com/2007/04/difference-between-oracle-apps-11i-and.html
Do you think my decision to do R12 is wise?Sooner or later, you have to :)
Choosing Between Release 12 or 11i
http://blogs.oracle.com/stevenChan/2007/02/choosing_between_release_12_or.html
Oracle E-Business Suite Technology EBS Release 12
http://blogs.oracle.com/stevenChan/applications/release_12/

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