It's just business 101.
Samsung is not going to release 4.2.2/4.3 for the Note 10.1 or even the Note 2 for that matter with the impending release of the Note 3 and Note 10.1 2013 Model.
It would hurt potential sales and upgrades. They will come but I doubt anytime soon.,
Sony Xperia Z Ultra LTE
Samsung Galaxy Note 8 N5100
Samsung Galaxy Note 10.1 N8013