Installing OS X on the ipad is a little extreme, doubtful even possible in the future.
The Ipad would need more memory / processor to handle the OS...unless you could create another version, like an OS X light? ...even if you could hammer down all the driver issues, it would require disassembly of the unit and modification.
that being said, i'm sure drivers will come out for some of it. i would think someone would put Linux on it before OS X.
...i would save your self the trouble and get an HP Slate...it already works.