The ban is on using language implementations that don't ship either as compilers with the dev tools (C, Obj-C, C++) or as runtimes on the device (JS) without prior approval (plenty of people embed Lua, and Unity3D apps still get approved).
Apple is obviously planning to ship MacRuby with a future release of Mac OS X as a fully supported language implementation, possibly with 10.7 in 6-12 months. Perhaps they will do the same with iOS, but they've had other priorities.
Apple is obviously planning to ship MacRuby with a future release of Mac OS X as a fully supported language implementation, possibly with 10.7 in 6-12 months. Perhaps they will do the same with iOS, but they've had other priorities.