I just pushed update of upcoming Ruby 2.2 package into dist git. This
time it is updated to r48879. Here  is the associated build (yes, ARM
failed, but I'd expect that second round would pass, feel free to make
your own build in case you want to experiment on ARM).
I dropped the release back to 1, since it seems that all bundled gems
have bumped their version since Ruby 2.1, so it should be safe (but if
you have installed previous builds, this version will not update them
due to this change, sorry)
Any feedback is welcome.
BTW Ruby 2.2 should be released in one week, i.e. next Thursday, so this
is good opportunity to provide last feedback to upstream.