The new Canon EF 24-105mm f/4L IS II USM lens was officially announced along with Canon EOS 5D Mark IV DSLR camera in late August 2016. And this Canon EF 24-105mm f/4L IS II USM lens was initially scheduled to ship in late October, but now it seems that the shipping date of this lens is delayed to early December 2016. The Canon USA authorized dealers Amazon US and B&H already changed the release date:
Amazon US: This item will be released on December 6, 2016
B&H: Shipping will begin Sat, Dec 10
Read more: Canon Black Friday Deals 2016.