I compiled this list from U.S. information and prices, other countries will be similar but maybe not the same.

October 2021 promos and GWP (gift with purchase):

• 30413 Flower Cart - Friends polybag, gwp Oct 1-31 in store and online, $40 in Creator 3-in-1/DOTS/Friends merch only
• 30370 Ocean Diver - City polybag, gwp Oct 1-24 in store and online, $40 in City/NINJAGO/Super Mario merch only
• 5006890 Flying Car - gwp Oct 18-24 in store and online, $120 purchase, VIP only
• 40452 Hogwarts Gryffindor Dorms - gwp Oct 25 - Nov 7 in store and online, $100 in Harry Potter merch only
• 30392 Hermione’s Study Desk polybag - gwp Oct 25 - Nov 7 in store only, $40 in Harry Potter merch only
• 2X VIP points Oct 1-31: 41685 Magical Funfair Roller Coaster - Friends, $99.99
• 2X VIP points Oct 1-31: 60302 Wildlife Rescue Operation - City, $89.99
• Double VIP Points on all purchases mid October, not announced so still speculation at this point, Oct 11-17 seems likely

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October 1, 2021 set releases:

Creator Expert / Adults:

• 10290 Pickup Truck (50s) $129.99
• 10291 Queer Eye – The Fab 5 Loft $99.99
• 10293 Santa's Visit $99.99, Sep 16 VIP, Oct 1 general, seasonal winter village set

Ideas:

• 21329 Fender Stratocaster (guitar) $99.99

Miscellaneous and seasonal:

• 40478 Mini Disney Castle $34.99
• 40494 Polar Bear & Gift Pack $9.99, "coming soon"
• 40498 Christmas Penguin $14.99
• 40499 Santa’s Sleigh $36.99

Technic:

• 42126 Ford F-150 Raptor $99.99
• 42131 App-Controlled Cat D11 Bulldozer $449.99

City:

• 60293 Stunt Park $39.99
• 60294 Stunt Show Truck $69.99
• 60295 Stunt Show Arena $99.99
• 60296 Wheelie Stunt Bike $7.99
• 60297 Demolition Stunt Bike $7.99
• 60298 Rocket Stunt Bike $7.99
• 60299 Stunt Competition $29.99
• 60309 Selfie Stunt Bike $7.99, "coming soon"
• 60310 Chicken Stunt Bike $7.99, "coming soon"
• 60311 Fire Stunt Bike $7.99, "coming soon"

Super Mario:

• 71395 Super Mario 64 Question Mark Block $169.99

Marvel and DC superheroes:

• 76145 Eternals’ Aerial Assault $9.99
• 76154 Marvel Deviant Ambush! $24.99
• 76155 Marvel The Eternals In Arishem’s Shadow $59.99
• 76156 Marvel Rise of the Domo $89.99
• 76184 Spider-Man vs. Mysterio’s Drone Attack $19.99
• 76185 Spider-Man at the Sanctum Workshop $39.99
• 76195 Spider-Man’s Drone Duel $19.99
• 76237 Sanctuary II: Endgame Battle - Marvel $39.99
• 76238 Classic TV Series Batman Cowl $59.99
• 76239 Batmobile Tumbler: Scarecrow Showdown $39.99 (larger version 76240 coming Nov 1)

updates:

• 43108 Bandmates series 2 - Vidiyo $4.99,12 different minifigures, available online in some regions but delayed until November in North America
• 40426 Christmas Wreath 2-in-1 $34.99 -- from last year, re-listed for sale on Oct 1