The BGTFans article and the renderings based on it seem to be very accurate if you want to see what it might look like. You're right that the ride is designed for comfort. Nothing special.
Theming could have been done for any coaster as they have already done. There is a reason most of the stand ups have been converted; and if they weren't, it was because the park already had a competing B&M. As of now, this seems short sighted and even worse now that Ice Breaker isn't the family ride it was meant to be. Y'know what would have given me the sensation of surfing: swinging seats (as countering the forces of a wave is exactly what surfing is really about). Im thinking Intamin's higher riding position with swinging. That would have been enough and wouldn't have me worried about comfort. If B&M could have provided that along with a more traditional loading style, combined with the launch that would have been something novel. As it stands, this just revisits an idea that was never good. If there were other degrees of articulation, I'm pretty sure they would have highlighted that. Like I said, if my legs have to withstand the forces I'm out. I have begged to be let off every stand up I have been on.
I think they had much better options (particularly a true family coaster especially when you consider the fact that they have multiple great examples in Australia and the US), but let's see what happens.
I don't think the Sea World company has really earned the benefit of the doubt as of yet. Odd announcement timing and not even a mention of the stand up (out) feature is pretty telling. I can't ignore all the signs.
Edit: And lol, Sea World had to include JTA and Kraken VR to lie to their customers again about this being the 7th coaster. In fairness, I would consider JTA if i was marketing, but jesus after all the GotG bs I've seen on yt that seems so much more shitty.