Here are some quick shots about the latency of HDTV configuration used at PAX for ZombiU
It's 30FPS video.
It's 4 frames of delay, maybe a bit more since 30FPS video isn't that as accurate but we're not even sure if ZombiU runs more than 30FPS anyways, also note that GamePad runs in 60FPS so i think it's its a few miliseconds more than I will caluclate:, you need at least 120FPS, but normally for these kinds of tests at least 240 is recommended.
So 1000 divided by 30 is 33,333333333333333333333333333333
4 frames means the latency is give or take ~133.3ms - I'm not sure precisely if the last frame should be fully taken in account because it could be somewhere in the middle of 33.3 or just at the end, so this is not at all accurate.
That is ridicolously
huge and how many of those visitors don't talk about it much or I didn't notice, ofcourse eurogamer did measure an LG HDTV with about 117ms lag, but even they didn't had a 240FPS camera, it was probably 60FPS, but I didn't researched that my self, but in the end of the day, for gamers don't worry all those HDTVs have crap config and it's clear that nintendo does not use the sync mehanism yet that will be required when the system is released.
Remember that the Game Mode does not take out all the latency, at best only half of it, expensiver models may have a bit better ratio though but still the better HDTVs also have more processing added on top so it's not clear across the board, you better test the HDTV you have your self:
http://hardforum.com/showthread.php?t=1327679
EDIT: Sorry for big pic it would mess up all the fine quality if resized it.