TL;DR:

• Prismatic will feature a “selection” of abilities from all 5 subclasses. Not everything from every subclass will be available.
• All movement abilities will be available (phoenix dive, thruster, etc.)
• Focus is on underused abilities that combo well with those in other subclasses.
• First mission of TFS will give you a complete Prismatic subclass.
• They have charts in the article that show what each class is getting. It’s too much for a TL;DR
  • Abilities with (starting) in this chart are the ones you get right away.
  • It’s still quite a good list of options for each class. It’s not like they took two from each and said done.
  • Most of the “meta” stuff is not in prismatic. Well and Banner of war are not available for example.
• Additional abilities will be unlocked in campaign, post-campaign, and through collectibles in the world.
• Abilities that required a specific damage type that have moved into Prismatic now can activate off any damage instead of just Void for example.
• Fill up the dark and light meters to activate Transcendence and get a special grenade.
  • Hunter: Solar/Stasis grenade that sends out a slowing cyclone then a scorching one. Attaches to surfaces like a tripmine.
  • Titan: Strand/Arc grenade that suspends targets then jolts them over time.
  • Warlock: Void/Stasis grenade that sucks enemies in and slows them before exploding.
• 21 new Fragments that are not damage specific for Prismatic. Some of them are listed in the article. Too much to cover in a TL;DR