Actually, even though the version numbers don't change, we're putting out new builds all the time in response to feedback and bug reports. We move a version to auto update when we're sure that, not only will some people benefit, but everyone should definitely use it.
If you do a force reinstall in the WebAdmin interface now, you'll get a slightly more updated 4.2.2 than the one you currently have. (Heck, we put out a new build just this morning...)
"...of shoes and ships and ceiling wax/ and cabbages and kings,/ of why the sea is boiling hot/ and whether pigs have wings."