Interface Customization » WoW API » API change summaries
This page lists archived summaries of changes to the WoW API (including the Widget API and Lua functions) as seen on forums and other places.
For changes to FrameXML, see http://wdn.wowinterface.com, it has a full repository of all FrameXML versions, including on-line diff engines and the works.
Version 1.12 (11200)
Version 1.11 (11100)
Version 1.10 (11000)