There are also no commits referencing iOS at all, despite Laurent saying that Apple have been working on an iOS port. Assuming Apple is working iOS compatibility, one might assume that they are targeting a future major iOS release, e.g. iOS 5.0. That is something that Apple categorically would not do in public for obvious reasons.
Laurent's commits are too few and far between lately for someone purported to be on MacRuby full time, to me they just look like cherry pick commits that fix serious bugs.
Like I've said before I am not saying what Apple is or isn't doing. You may be right, but what you have said is hardly compelling evidence. Apple is hardly going to carry out development in public on something that inadvertently reveals features or implementation details of of their golden geese products, i.e. iOS devices.