Yep, the spike will be a 450° anticlockwise-rotating spike. BGWFans nailed pretty much everything else with the layout, and now we do know 100% that this will be an Intamin due to the track and trains on the plans being identical to Pantheon's.
Here is an updated NL2 animation by
Intim305 and
Jake Anderson:-
I am almost 100% sure that the backwards spike will be beyond vertical, and similar to that of a Surfrider spike, based on the support structure for it. There are still several questions, however, such as whether there will be any airtime launches or not. I am leaning towards no honestly, but I am hoping they manage to sneak at least one in.
I watched Coaster Studios' analysis of the information we have, and he put forward a couple of valid propositions. One, that this and Pantheon were originally supposed to be part of the same ride, and that if some of the seats on the train were facing backwards, that would really improve re-ridability and popularity.
One final thing, here is the leaked colour palette for the coaster that was rooted out by Adam of BGWFans:-
This will look beautiful when it is built. <3