The funny thing is; That's not listing any of the major issues I have with RubyMotion. One of them would be that I bought the software and I can't integrate one external library I need, but, one of the greatest thing about RubyMotion is that it has been getting updated every day. So I bet you they'll update it with any new version of the SDK before it gets released.
The reason you should be excited about RubyMotion is that it's just easier to read that ObjC since it has a lot less noise, and lot of goodies you just "get" from Ruby's core. And the debugger is fantastic!