I'd buy you a create if in the coming months the iPad was running Windows8. Not because I'm desperate to see it, just because it would be a miracle. The last jailbreak took many months of work and that was just to gain root access to the stock OS, not to mention the is no bootrom exploit for iPad2 yet.
Have you any idea how challenging it is to get an iDevice to even dual boot 2 versions of IOS, let alone port another OS to run on Apple hardware?
Since we have had excellent low level exploits for iPhone4 and iPad1 for a long time now, why is there not a workable Android replacement if as you say, IOS is so replaceable? Android is an open source mobile device operating system after all? Heck, there's even a tablet version of it. That project fell flat on it's face a long time ago. Why? Because there are some challenges that are just not worth the effort.
Don't believe the hype. Windows 8 is not some magical code base that can be just dropped onto any old piece of hardware. This is Microsoft. They haven't been transformed into the worlds most dynamic OS developers overnight.
Anyhoo. Sounds like your psyched for W8. Just save up for a nice shiny Windows8Tab which will actually be designed to run the thing. By the time they hit market I'll probably be enjoying my iPadHD Retina Edition...