Halo 6 will not be at E3 2017. No trailer, no beta this year, and still no Halo 3 Anniversary. However something else will be shown.

Source(s):

No Halo Beta 2017 http://ift.tt/2qEj1xW

No Halo 6 at E3 2016 http://ift.tt/2rdNnUV