11 new flags have been added to the game client in 0.6.5.0, 6 of them are decorational, 4 are the new special effect flags, and 1 unknown.

As information comes to me, I will update the post for the flags that I know very little about at the time of posting.
D-Day:

This flag will commemorate D-Day, and must be relevant to an in-game event that I am un-aware of.
Hood:

This will be the super-bundle flag for the HMS Hood once she goes on sale.
Dunkirk:

This flag will likely be related to a commemoration to the evacuation of Dunkerque. If there is any connection to the Movie “Dunkirk” I am presently un-aware.
NA EU Community:

This flag must be a tie in to an upcoming and yet to be announced event that will likely take place on the forums, however I have yet to find any announcements or competitions in the NA forums regarding this.
Kaga:

This will be the special premium flag that will come with the most expensive bundles for the upcoming premium IJN Kaga.
Victory Day EU:

This flag will likely commemorate EU’s victory day, I feel like I have seen this flag being announced but I cannot find the news post, so it must be me going mentally insane.
Special Flags:
All these flags can be earned in the Hunt for Bismark Campaign, and I predict they will come back in future campaigns or some other special methods for earning them.
Wyvern:

+50% Credits
Red Dragon:

+100% XP
+100% Commander XP
Hydra:

+50% XP
+150% Commander XP
+250% Free XP
Ouroboros:

+777% Free XP
Other?:
Dragon Boat:

I’ll be honest, I’ve got no idea wtf this flag is or what its for.
