Links for Revit 2015 UR9 for R2:
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Enhancements List

Download link for Revit 2015 UR9 not for R2:
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Enhancements List (plain text):
Improvements made in Update Release 9
 Revit 2015 build: 20150702_1515
 Revit 2015 R2 build: 20150704_0715

Autodesk® Revit® Platform 2015 Updates
 Improves stability when deleting an element which contained an invalid partition ID.*
 Improves visual fidelity when exporting to DWF.*
 Improves data consistency between a schedule view and a schedule instance on a sheet.*
 Improves stability while upgrading Revit 2012 projects.*
 Improves stability while editing families.*
 Improves stability when using the Options dialog to log into A360 from a workshared central file.*

Autodesk® Revit® MEP 2015 Updates
 Improves stability when upgrading a project that contains user-created pipe types.*

Autodesk® Revit® Structure 2015 Updates
 Improves stability while when placing a slanted column or a beam based on a Generic Model Line based family.*
 Improves stability when reloading an annotation symbol family used as a symbolic representation of brace elements on plan views.*

Autodesk® Revit® API 2015 Updates
 Improves stability while when editing families which use external resources for keynotes.*