From DSOFA
From what we can tell, we will get: (Information from our test server)
**This is test server information, all items and information talked about in this post are NOT GUARANTEED to be in actual Patch**
- Small sea skill re-balance for certain professions
- New sea stats (work similar to reaction and willpower on land)
- Jiawu Bay instance with a couple of daily tasks related to them
- Jiawu Bay exploration
- Level 160+ sea gear
- Sea gear promotions
- Sea gear forging with Luminous Pearls
- Seville Golden Tower levels 71-80
- Small rework of wedding buffs
- Flags (a new item that go between hat and necklace), still unclear how to obtain one, possibly trough BG's
- New gear upgrading NPC in seville port (has slightly lower prices for gear up to inquisitor)
Flag NPC only has 3 flags for land, 3 for sea. There are two timed flags at municial ministers that last for 7 days (the one currently equipped on right).
**Edit 2**
Its still unclear how the flags will be obtainable. fun mentioned something about battlegrounds, so we can assume they will be obtainable trough petro and labrinton, but don't hold my word.
Flags also have no stats and there's a sort of an upgrade interface at which you spend gold ingots to add stats. So you can chose whether you'd like defensive or offensive stats.

Flag interface is there, mentions something about battlefield honor, but no idea how will honor be available yet, its up to the IGG I guess.
*edit*
Flag NPC stands to left of Daily Instance Quests Giver in Sanctum.
The first flag (infantry or Gunner) requires; 5 Battlefield honor + 12 Gold Ingots
the 2nd flags (Guardsman &Sailor) require ; 1 Flag exchange Medal
the 3rd flags (Warrior & Chief) require; 2 Flag exchange Medals
No idea where to get Medals or what type of battlefield honor is needed.
No idea at what level or rank the flags become available, but DSOFA's picture shows 150 and 170 needed.
(my test characters are stuck at prof level 68 & 69) - Ele

New sea stats

Sea skill re-balance

Sea gear promotions and forges

.