Seems to me this post regarding the Tegra 2's lack of NEON support, and the increasing use of NEON by Google apps, means that the chances of an official update for the Tab 10.1 beyond 4.0.4 is probably zero:
https://plus.google.com/+CyanogenMod/posts/8wcuSVkr7zR
Let it go. I'm just grateful I have a chance to play with 4.2 via CM10.1. I love this site.
Who needs the update, which may just be to 4.1.2 perhaps. That is terribly outdated at the moment as I have about 4 or 5 flying, smooth and pretty stable 4.3 ROMs from which I can pick and change anytime I wish to. As long as there are developers out there ready and willing to develop ROMs for the P7500, I do not care about Samsung's touchwiz, neither can they compel me to buy another tablet!
Cheers.
Sent from my GT-P7500 using xda app-developers app