Globzer's dumpster

R1C1: Completely new gamemode (Revamped old GMs doesn't count, however something like SWORD Kris mode does)

R1C2: Sans appears in the next Dark World

R1C3: Ralsei learns FireShock

R1C4: Tracks foreshadowed by Bibliox proofread act (ROOTS, FESTIVAL, SYNTHESIS, AMPHITHEATER) will appear in the next chapter

R1C5: Characters are confirmed to be scheming against the Player during "Close your eyes and think of.." sequences

R1C6: ANOTHER CONTACT (Like the one at the beginning of the game)

R1C7: There are gonna be humans other than Kris (Either at the festival or it will be confirmed that Dess is a human)

R2C1: Ralsei tells another truth about the Dark Worlds he was previously silent about

R2C2: Asgore-Titan theory confirms to be true

R2C3: There's going to be a character similar to Flowey or Chara in their behaviour and antics

R2C4: Snowgrave will have a completely different Dark World for us to explore

R2C5: Forgotten Man ark will be over in this chapter

R2C6: THE ROARING will happen at the end of the chapter

R2C7: Noelle will be playable once again, regardless of the route taken.

R3C1: There's gonna be a new, third battle theme

R3C2: Snowgrave will end on chapter 5

R3C3: Asgore Truck meme gets referenced

R3C4: There's gonna be multiple completely different Dark Worlds (e.g. ones in Asgore's shop and at The Festival)

R3C5: We will fight the second Titan in the next chapter (Also I think its ost will be called 'WARRIOR')

R3C6: Papyrus debuts

R3C7: Knight Rematch

R4C1: Mad Dummy ghost appears as MewMew in the Dark World

R4C2: Massive lore dump about Dess and maybe even her face reveal

R4C3: Seven flowers resemble seven human souls from UNDERTALE

R4C4: FREE SPACE

R4C5: Woody theory confirms to be true

R4C6: All floral themed designs we've seen so far are just a big red herring and the chapter itself will be much darker or even take place in a completely different location

R4C7: Susie's white pen of hope arc continues

R5C1: End of the "How long until she smiled?" ARG

R5C2: Carol and Asgore are the two final bosses of the chapter

R5C3: Jevil makes a cameo similar to Spamton (That's why he's also in foam on the pic lmao)

R5C4: TwistedSwrd will be obtainable in this chapter (i.e. Pure Crystal is obtained in this chapter)

R5C5: THE ROOTS theory confirms to be true

R5C6: Onion-san returns and their arc continues

R5C7: Kris loses his hand

R6C1: We find out, what Kris promised and what is their collusion with the Knight or Carol

R6C2: Ralsei will get his solo-battle with the next Secret boss

R6C3: FRIEND will have references to Japanese culture (Another Wachifield reference or Maneki Neko as people suggested)

R6C4: Asriel returns to Hometown

R6C5: Shadow Crystals are confirmed to contain DETERMINATION in them

R6C6: There is going to be a character alternative to Tenna

R6C7: The SOUL is transfered to Noelle's body at the end of this Chapter's Snowgrave route segment

R7C1: The sacrifice is made

R7C2: Rudy dies

R7C3: Asgore will defend the fountain, making him the final boss of this chapter

R7C4: More DEPTHS lore (Place where the Titans, their spawns and maybe other characters like FRIEND and the Roaring Knight come from)

R7C5: Kris and Susie will try to retrieve the code from inside of Dess guitar in the next chapter

R7C6: The Vessel debuts