Just got RMAknucks, and they do look like Valve has a V2 going out now. 
Notable differences, from outside-in:
Cardboard box is now Valve-themed. Upright warning is now a companion cube, stuff like that. Neat but extremely minor, don't think day-1s had this. Also says Assembled in China.
New box. Color is slightly more faded grey instead of black.
Controllers look identical overall, although nylon cord that sticks out of the inside area of each controller (what you use to adjust the backhand strap) is no longer solid black, instead black w/ grey like the handstraps themselves.

That's all just little differences that tipped me off, but as far as actual performance is concerned:
Left joystick down-left is what drifted for me. Never had any clicking issues whatsoever personally. New controller click however is much more tactile than old, replaced controllers. 
While old controllers did click down when directly upwards/downwards, they lacked a lot of the volume and tactility that you would expect- might have been what people were bitching about, but they certainly did click still. New ones however are xbox/ps4 "established norms" tactile and feel nicer, although this is personally a minor improvement, but points to the fact that these might be overhauled and fixed. 
Anyway just RMA and follow instructions if your Index remotes bust, they have one of the best replacement programs I've ever seen and you lose nothing doing it.