Microsoft definitely has had more experience with the tablet concept in computing than most, so seeing them showing off their latest concept in answer to the rumors that Apple will soon be releasing something of their own, is not that shocking.
While we know next to nothing about what Apple has in mind for their own tablet, in the above link we can plainly see where Microsoft is headed. And from the looks of things, MS might have an edge here with something to show us now.
But let us not forget that Apple sometimes takes a bit longer in order to allow the competition to tip their hand. There is something to be said for waiting for the right moment to release a product. And clearly, it seems that this is what Apple is hoping to do with their own tablet…once the time is right.