Where are the official release notes for Cyanogenmod, in particular the 9.1 release? I wasn't able to find them.
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This really isn't a good fit for this site. Certainly the official changelogs will have that information. – ale Sep 05 '12 at 17:04
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1They're a bit hard to find though, at least if you assume they are called "release notes" :) I will rephrase my question to be more general. – Nova Sep 05 '12 at 17:19
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http://www.cmxlog.com/11/ is a nice, neat site for checking out nightlies – svarog Aug 04 '14 at 14:16
3 Answers
Did you check with the official changelog site? Or the XDA thread on 9.1? The latter mentions http://cm-kang.appspot.com/anzu/ics for the changelog. And then there's this page where you even can filter changes by devices (probably the best source to check).
If you need more details: All that from page 1 of a simple Google search for cyanogenmod changelog "9.1" (<- hint! ;) )
To the first (and explicit) question: If there were any new features? That probably very much depends on your device. So using the last changelog source I mentioned, filtering by the device you want to know this about, you will be able to answer your question. As I don't know your device, I can't ;)

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Edit: OP has rephrased his Question
A good start is also the CyanogenMod blog
For CM9.1 it's:
A new NFC payment system, SimplyTapp has been added:
Let’s try something new: CM9.1 and SimplyTapp:
Welcome to Tapp! A near field communication (NFC) payment platform for the CyanogenMod community and powered by SimplyTapp. Founded by two CM enthusiasts, Doug and Ted, Simplytapp provides a method for evolving, securing and expanding NFC payments.
See CyanogenMod's blog post for more info.

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A condensed changelog containing only "notable new features" can be accessed from within Cyanogenmod via the settings menu -> about phone -> view changelog.

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