KDMO update seems fairly good

• New dungeon, seems to be entirely for money
• Arena update
• New 5 option Ring w/CD&HT
• OMM/Kuzuhamon Miko Mode rebalance
• Ticket Exclusive Inventory
• Another Attendance event for SSS/SSS+ or Accessory box

https://www.digimonmasters.com/news/newsBoard_sub.aspx?o=787457&Btype=Update

For the new dungeon, it appears you either get passes from other dungeons (FDGH, D-Reaper Area, Shadow Lab Hard; boss defeated=drops pass with certain percentage), exchange them with 50 Arena Hard coins, or buy them from the cash shop exclusive tab.

There's up to 7 rounds, each round has a set percent of Roachmon to spawn, each round the chance to encounter Roachmon increases (1=0%, 2=20%, 3=40%, 4=80%, 5=85%, 6=90%, 7=99%).

Roachmon give 250M ea, Round 1=200M, 2=300M, 3=500M, 4=1T, 5=3T, 6=10T, 7=100T

After 2 Roachmon have been defeated the dungeon is cleared.

This is a solo dungeon.

For Arena, it says "[ Digimon Arena Admission Ticket ] will be sent to your mailbox through weekly maintenance .", that makes it sound like you only get 1 ticket a week.

I did find this video from Penance.

At the start you can see it clearly shows only 1 person allowed for both normal and hard, it appears to work similar to Gankoomon training ground, when you go in the first round digimon is already there, each digimon you kill will summon the next round's digimon.

For all of the rounds he did a little under 40 million damage, this was for Arena Normal.

Arena Normal has a total of 10 rounds with a 20 minute time limit, Arena Hard has 5 rounds with a 15 minute time limit.

There are buffs/debuffs for Arena Hard, copy&paste of them:

• Digimon Arena [ Hard ] The buff is applied in a specific round .
• Attack power +50% / Skill damage +100% / Critical attack power +100% increase
• Defense +50% / Max HP +50% / Max DS +50% increase
• Digimon Arena [ Hard ] The debuff is applied step by step depending on the round .
• Movement speed reduced by 20% / 30% / 40% / 50%
• Damage dealt reduced by 5 % / 10% / 15% / 20% / 30%
• Block rate reduced by 20% / 40% / 60% / 80%
• HP Continuous Decrease: 250 / 500 / 1000 / 1500 / 2000 every 5 seconds.
• Damage received increased by 5% / 10% / 15% / 20% / 30% reduced.

As for Arena Coin Exchange, it's just too large to list everything, but will list some notable ones:

Normal:

• Royal X-Knight Bracelet=100 coins
• Xros Chip=20 coins
• Highest Memory skill=100 coins
• Memory Cubes=80 coins
• Shining Spirit=40 coins
• SSS box=2000 coins
• Santa/Soccer suit=50 coins
• Arena Hard coin=2 coins

Hard:

• Orange OT vice=1000 coins
• Shining Arena Ring=1000 coins
• Magnetic ID=500 coins
• OCS=2 coins
• NCS=2 coins
• Gehenna=300 coins
• SSS+ Box=1000 coins
• DT Headquarters Master Key=50 coins

The Shining Arena Ring is basically a Zero Unit Ring that has CD (1-20%) and HT (100-500) replacing the third DS/HP option, however these don't have max stats.

The SSS box makes no sense unless I'm somehow misunderstanding something, you can exchange 2 normal coins for 1 hard, so they're effectively the same price but with arguably worse rewards.

These are new magnetic IDs are don't mention a time limit, so presumably they're permanent, however each one works with a specific tamer, although they o give 5% SK, 500 AT, and 300 HT.

Both OMM and Kuzuhamon Shrine Mode got nice rebalances, although only OMM got an AT increase, someone already updated the wiki so you can view them there; Kuzuhamon Miko Mode's F3 is effectively a better version of HoH Highest now since it has a 30 second cooldown and restores HP by 30%, which makes it very interesting even if it doesn't do the highest of DPS, especially since you can throw HoH Highest onto it giving it as much as 60% HP recovery every 30 seconds, a party of 4 of them would be kind of crazy considering how much HP they could heal.

Ticket Exclusive Inventory gives way more than enough storage to store all of your dungeon passes, it comes maxed out @ 200 and you can't increase it (Wouldn't need to anyways), passes are used from this first, so there's not even a reason to have your passes in normal inventory.

SSS/SSS+ and Accessory box at a quick glance appears to be the same one from last time, assuming the percentages are the same, SSS/SSS+ box has a fairly good chance at giving AO X while accessory box seems good all-around.