Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey (known as Mario & Luigi RPG3 DX in Japan) is an upcoming game for the Nintendo 3DS, set to be released in Japan on December 27, 2018, in the Americas on January 11, 2019, in Europe on January 25, 2019, and in Australia on January 26, 2019. It was announced in a Nintendo Direct on March 8, 2018. The game is an enhanced remake of the 2009 Nintendo DS game Mario & Luigi: Bowser's Inside Story. The remake also features another story where Bowser Jr. takes action on an adventure, similar to Minion Quest: The Search for Bowser, with two important differences shown so far: a slot for an additional second-in-command who will have its own actions just like Bowser Jr. as well as formations for the troops.

List of changes
(Footage here: https://youtu.be/PEQKugZx_YI Some minor spoilers ahead.)
 * Badges appear to be obtained much earlier in the remake. Instead of being received from Princess Lipid in the Flab Zone, they are shown to be in the battle with Scutlet in the Flame Pipe, implying that they were obtained sometime earlier. It's possible this is only due to the game being earlier in development at the time.
 * Like in Mario & Luigi: Dream Team, players can choose whether they are right or left handed, altering the position the 3DS needs to be in during giant boss battles.
 * Number of hits of Green Shell Special Attack for the Bros has been reduced.
 * Yoo Hoo Cannons now aim at the enemy while the attack is in use.
 * After finishing the Goomba Storm attack for Bowser, he will raise his left hand to look up at the Goombas as they fall.

Captain

 * Bowser Jr.

Second-in-commands

 * Ludwig von Koopa
 * Morton Koopa Jr.
 * Iggy Koopa
 * Wendy O. Koopa

Troops

 * Kamek
 * Fire Bros
 * Ice Bros
 * Mechakoopas
 * Lakitus
 * Spinies
 * Goombas
 * Boos
 * Bomb Boos
 * Big Tail Goomba
 * Goomba Tower
 * Paragoombas
 * Hammer Bros
 * Koopa Troopa
 * Koopa Troopas (Red)
 * Koopa Paratroopas
 * Shy Guys
 * Fly Guys
 * Spear Guys
 * Bandits
 * Tail Boos
 * Horned Ant Troopers
 * Ninjis
 * Buzzy Beetles
 * Spike Tops
 * Fire Stalking Piranha Plants
 * Spikes
 * Para-Biddybuds
 * Chain Chomps
 * Mechakoopas
 * Pokeys
 * Iggy Koopa
 * Larry Koopa
 * Roy Koopa

Bosses

 * King Bob-omb

Troops

 * Hammer Bros
 * Ice Bros
 * Lakitus
 * Spinies
 * Bomb Boos
 * Urchins
 * Bob-ombs
 * Chuboombas
 * Choombas
 * Drillbit Crabs
 * Fly Guys
 * Borps
 * Fawfulcopters
 * Oho Jees
 * Toothies
 * Sockops
 * Broozers
 * Chargin' Chucks
 * Mechakoopas
 * Fire Stalking Piranha Plants
 * Captain Goomba
 * Captain Shy Guy
 * Captain Boo
 * Captain Koopa Troopa