Just announced with some details, "Summer 2018" -- weather delays pushed the date back a bit from end of June.
Two articles:
https://blog.universalorlando.com/whats-new/new-universal-orlandos-cinematic-celebration/
and
http://www.the-leaky-cauldron.org/2018/06/14/exclusive-new-cinematic-nighttime-show-at-universal-
orlando-will-celebrate-harry-potter-more/
are two articles about it
It is a 19 minute long show that includes Harry Potter, Jurassic World, Tolls, Minions, ET, Fast & Furious segments among others with a new 6500 person capacity purpose built viewing area in the Central Park section of Studios.
Some quotes from the articles:
"And, it’s all seamlessly projected on full panoramic water screens, accented by pyrotechnics and – for the first time ever – more than 120 dancing fountains with projection mapping. The entire waterfront of the Universal Studios lagoon and surrounding buildings will transform into a vivid celebration of epic movie moments and beloved characters."
“It’s something we haven’t been able to do outside of the ride attractions. There’s a moment where you see the New York facades start to freeze, and we know what happens when things are freezing! It means Dementors are near. There’s a Dementor moment that will happen over the water, and of course the culmination of that is Harry appearing in the end, and casting ‘Expecto Patronum’!
“In that victory moment light will literally pour from the lagoon – the fountains will raise, John Williams’ score will culminate, and we’ll eliminate those Dementors in a celebratory moment. We’ll have banners falling (in media) on our New York facades, showing the four Houses of Hogwarts.”
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“This show is primarily driven by visual imagery from films, but also music – that’s the thing that we really are excited about. A lot of our nighttime shows in the past have been very score-based, which is great; they’re epic. This show has that, as well as a little bit of pop music. Our
Fast & Furious section really tells the story of the speed in that brand, as well as the music featured within those films.
Trolls is just a big ol’ colorful party – you’ll see the main characters of
Trolls all throughout our media, you’re gonna hear ‘Can’t Stop The Feeling’ sung by Justin Timberlake. It’s a really different texture to any we’ve had in our previous nighttime shows.”
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"Guests will now be able to watch our nighttime show from a single perspective. They’ll look out at the lagoon and face our New York facades [where projection mapping will take place to add to the media displayed on the lagoon]. We’ll ensure that every guest in that area is going to see the exact same show, which is very different to what we’ve done in the past!”