What is Goku's red aura form in the new Dragon Ball Super opening? Is it regular Kaioken? Is it Super Saiyan God Super Saiyan with Kaioken? Is it his Super Saiyan God form? Is it something new? You can see the opening here:
(The question of the topic is what form it is, the other questions are explanatory.)
Update: 03/08/2017 . Super Saiyan Blue transformation was seen first in merchandising toys. Some people is saying the image behind this chocolate Goku merchandising could be Goku's new form and related to this red aura form we see in the opening.
And recently a tweet was made by a Dragon Ball Super writer saying he's expecting a new form