Pre Raid is
Sparrow "race" through bits of the ruined Reef and ending in the cargo bay of a Ketch, all the while being shot at by Shanks and Fallen Jumpships. There are various tunnels leading to the Ketch and the correct tunnels (identified by Fallen Light sticks) change every playthrough. But the first one can be used to figure out the pattern throughout. (Ex if the first is Tunnel 1 then the next ones will always be 3, 2, 2, and 1)
"Mini"-Boss is
Wolf Walker and Archon
Spider Tank w a Servitor as it's main gun
Escorted by a Archon Priest looking "Captain" wielding a Wire Rifle, although he's on got Gorgon health, he flees early in battle, if you kill him you get 2 of a Random Radiant Mat. or the Raid Class Item. The battle is essentially the Devil walker battle but with Servitor blasts (near death if hit because he's a boss) and it's legs are protected so you have to shoot the Servitor gun while it's charging to force it to open the Weak spot.
Final Boss is
Kaliks Prime Exiled Servitor
Involving use of the environment to down his shield, he can then only be Precision Hit, this needs to be done about 4 times on Regular Raid - 6-8 on Hard.
Raid Exotic is Lord of Wolves Shotgun.
Essentially Advanced Devils Lair.
English
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This seems very detailed. And, if true quite disappointing.