Since Star Planet just got closed down, I'm assuming we're supposed to get all the changes up to this update:
https://orangemushroom.net/2016/06/19/kms-ver-1-2-257-optimization-new-events/So I reviewed the Patch Notes, and once again, GMS missed several changes on the Patch Notes.
Can someone check if the following changes got implemented?

In certain boss content with Death Counts, when you have remaining Death Count, you will now resurrect automatically after 30 seconds. You can revive manually like normal but after 30 seconds, you will be automatically resurrected after a 5 second delay. It will apply to:
Normal Cygnus
Chaos Zakum, Chaos Pierre, Chaos Von Bon, Chaos Bloody Queen, Chaos Vellum
Normal/Hard Suu, Normal/Hard Damien (Confirmed)
Certain bosses have received various changes.
Horntail (Easy, Normal, Chaos)
The area around the left and right heads has been modified to allow better skill usage.
Pierre (Normal, Chaos)
An error where you would not be able to activate any skills if you revived after being killed by the 3rd hit has been fixed.
Von Bon (Chaos)
Falling clocks will no longer be created after Von Bon’s death.
Suu (Normal, Hard)
Suu (Normal)’s daily entry limit of 1 has been removed, you can now re-enter after 30 minutes.
Through platform pattern and other gimmicks’ optimization, the memory usage of the client has been reduced.
Damien (Normal, Hard)
Damien (Normal)’s daily entry limit of 1 has been removed, you can now re-enter after 30 minutes.
The ‘Space’ key label on the Stigma skill has been changed to the ‘NPC Chat’ key.
An error where Damien was set as a stationary monster has been fixed.
Damien’s Soul and his Soul Skill have been added.
Begin Hunting (regular): Summon Damien for 120 seconds, dealing 1500% damage on up to 8 monsters (level 2 – 1800% damage on up to 9 monsters). Cooldown of 180 seconds.
Sword of Destruction (magnificent): Summon Enraged Damien for 120 seconds, dealing 1800% damage on up to 10 monsters (level 2 – 2200% damage on up to 12 monsters). Cooldown of 180 seconds. (Confirmed)
Certain bosses have been added to Murmur’s Soul Collector. Filling out the entire page will upgrade that boss’ Soul Skill to level 2.
Balrog
Guard Ani
Mu Gong
Urus
Arkarium
Pink Bean
Magnus
Suu
Damien
Black Knight Mokadin
Crazy Mage Karianne
Human Hunter July
Charge Type CQ57
Fighter Plaid
Zakum
Hilla
Von Bon
Pierre
Bloody Queen
Vellum (Confirmed)
The Boss Arena content has been removed and is no longer available. Characters inside will be able to use the portal to leave but they cannot enter again. (Confirmed - Even though the Boss Arena Emblem is no longer available, GMS just added Emblems for all non-KMS Classes!)
Elite Monsters and Elite Bosses will no longer use the Magnet skill. (Confirmed - But what of the Monster Collection where some Elite Monsters must be the Magnetic prefix to collect them?)
Night Lord and Shadower’s Shadow Partner and Dual Blade’s Mirror Imaging‘s cast delays have been decreased. (Confirmed - What used to be a horrid 3 second cast delay, got significantly shortened to a swift 1 second cast delay!)
New monsters have been added to the Monster Collection.
The Demon monsters have been added to the Victoria Island -> Sleepywood area.
The Fantastic Theme Park and Korean Folk Town monsters have been added to the Ludus Lake area. (Confirmed)
New Monster Collection related items have been added.
Red Stirge Cube Chair (Confirmed)
Horntail Monster Egg
Chaos Horntail Monster Egg
Bellflower Monster Egg
(Monster eggs? You mean Monster blooms?)
Certain monsters will now appear in certain areas.
The Master Dummy will now appear occasionally in Mu Lung Dojo’s Advanced Training Area.
The Gigantic Bellflower Root will now appear occasionally in Herb Town’s Bellflower Valley. (Confirmed - Now players can finally complete the Mu Lung Codex Set!)
Uncompleted Sudden Missions will now only decrease your daily limit if you have begun to complete them. (e.g. if you afk and receive some Sudden Missions and they time out, you won’t have your daily limit decreased anymore). (Confirmed - You can now basically reroll Sudden Missions!)
Comments
https://orangemushroom.net/2016/03/23/kms-ver-1-2-254-skill-balancing/
And also this one since we also talk about game optimization:
https://orangemushroom.net/2016/05/21/kms-ver-1-2-256-minor-changes-and-new-events/
You can now add Chaos Pierre to your collection by hunting the Chaos Red Pierre and Chaos Blue Pierre. (It's gonna make Pierre hunting a LOT easier XD )
When a Kritias Invasion begins, you will no longer be taken to a specific channel, you will immediately start the invasion in your current channel. (FINALLY THIS HAPPENS
You can now enable the ability to right click items to sell them in NPC shops. (idc much, i wish we could just sell multiple items at time)
An alert will now appear when an item in the Repurchase tab of NPC shops is about to be overwritten. (would be nice)
Boss Entry Reset Tickets will now be reset at midnight on Thursdays like boss entry limits. Omg FINALLY!!!!! really hope we get this change as well.
I think I am good for now lol.
TBH I'm not sure I like the second one.
I don't know about you, but I NPC a lot more than 10 items per login session. I don't want to have to click through a warning for every item after the 11th.
I just realize the second one can be annoying x.x
the boss respawn timer isn't in yet.
also just tested it with normal selling, still no warning....