[Zope] Zope 2.8 Extension Class documentation?

[Jake]

"Because there are some backward incompatibilities, we will prepare a
document describing the incompatibilities, with guidance for identifying
and making necessary changes."

http://www.zope.org/Wikis/DevSite/Projects/Zope2.8/RiskFactors

Has that document been published as I am having a problem with an older
product in Zope 2.8.4.

Jake
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