I think you're giving MS more credit than they deserve here.they have been pushing the tablet and pen computing for quite some time. really, a pen is not a whole lot different than touch. anyway. i think they have the right idea. good idea, terrible implementation. but hey, they have to innovate somewhere.
A
Touch sensitive screens and mobile computing in general was around long before MS jumped into the pen computing/tablet market and what did MS bring? Nothing other than simply integrating digital ink into the main OS and pushing hardware partners to produce some crappy tablets.
Apple integrated digital ink technology into OS-X a long time ago also, they just didn't make any noise about it because it's a trivial accomplishment. Apple also hasn't yet produced any tablet hardware because there is nothing there that really works yet.
MS will do with multi-touch exactly what they did with everything else. Incorporate it into the big box-of-everything that is Windows. So multi-touch "support" will be added, and partners will be encouraged to produce "multi-touch" hardware to wow everyone. It is as likely to succeed as the ten or so other times they tried ripping off whatever the latest thing is and stuffing it into Windows.
Apple has patented the hell out of multi-touch though so what we will see is workarounds and cheap copies of it only, while Apple is already working on true innovations with "multi-touch 2."