Please consider lowering this bug report severity. While it would indeed be really nice to get a more recent build of Mono in Debian repositories (I am sure the Debian Mono Group would be happy to get help with this), keeping the current outdated build is much more useful than not having access to Mono at all from Debian repositories.
Here we rely extensively on the Debian-provided 6.8 build to run non-free games built on top of the XNA/FNA engine through ./play.it (https://wiki.debian.org/Games/PlayIt). Losing these packages would make us rely on the binaries and libraries shipped by the game developers instead, that are usually older than the current Debian build. More generally requests for the packaging of new upstream releases tend to use a "wishlist" severity level, not "important" and even less "serious".
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