I think they will be vague, with something like "also opening this summer..."
This is not as major as Transformers, but I would say it's a step above the Spider-Man upgrade, so I think they will make some noise about it, but I don't think they'll have a major marketing campaign around it. It might be the "side dish" to Transformers in the marketing for this summer. Hopefully they'll have a presentation similar to Transformers' in the lagoon, because that would be fun! And they'll probably include the new Springfield/Krustyland area in their #LikeYouMeanIt campaign.