I've interested in the tablet version of Ubuntu Linux, it looks like it might be a good way to get around Android's Javaness. But I really hope they don't fall prone to the two headed monster Windows has become. It should be possible to design an OS that works equally well in touch as it does in non-touch environments.
ARM devices may already outnumber X86 devices. The main problem with ARM is that they aren't yet powerful enough. Rumour has it iPhone 6 will have dual quad core ARM chips in it.