encyclo - 2:26 am on Oct 8, 2009 (gmt 0)

So if I remain to use # (i.e. do not implement #!), would this mean that in this way I can avoid the duplicate content?

As I understand Google's proposal, you are correct in this analysis. The issue for Google is the same as for you - currently they cannot adequately distinguish distinct content changes on AJAX-driven pages, and they can't second-guess without creating never-ending duplicates. The proposal would offer the appropriate hints to Googlebot as to what is unique content and what is not.

Google is at the forefront of AJAX usage, but they are not looking to improve indexing their own content, rather to promote AJAX adoption and improve their SERPs. It is in their interest to get more AJAX-driven content into their search results (improving search quality), and such inclusion would be mutually beneficial for webmasters who are currently wary of adoption AJAX solutions due to the technical challenge of getting into the current Google index.