Yes, talking medium to long term. Look at how long it took computer programs, even OSes, to take full advantage of 64bit. It's a long road which is why Apple is starting to lay ground work now. I didn't mean to suggest the next version of OS X will be merged, or even the one after that, or after that one, but it's coming.
Sooner than later, tablet's feature set will closely match that of laptops just as laptop capability did with desktops. Apple is reading itself for that day. It's the same reason why they updated iLife and iWork on both OSX and iOS using the same underlying code, even at the cost of features on the OSX version. It's laying the ground work. Next version will start adding features back to both.
But this is very different than Microsoft's Win 8 plan. Microsoft essentially is trying to get the masses to bend to its will of having the same OS on every platform. Apple is just preparing for when consumers are ready for that day.