This is the new's image they put up about it:

This is a image of the new sets, to be called Dryad I believe:

Here are some pictures of the new mobs in the 'instance':

About two mobs were left out, due to the size of them.
Boss mobs i think.

new rings:
Fire Ring (Adds STR and Critdmg)
Land Ring (Adds STA and Def Rate)
Water Ring (Adds INT and decrease of magic motion time)
Electricity Ring (Adds DEX and Parry)

all of these new accessories can be upgraded to +20 with moonstones.
the rings start adding the secondary stat at +6, which is capped at 5% for every ring
example (Fire Ring):
+0 STR+1
+1 STR+2
+2 STR+3
+3 STR+4
+4 STR+5
+5 STR+6
+6 STR+7 CritDmg+1%
+7 STR+8 CritDmg+1%
+8 STR+9 CritDmg+1%
+9 STR+10 CritDmg+1%
+10 STR+11 CritDmg+1%
+11 STR+13 CritDmg+2%
+12 STR+15 CritDmg+2%
+13 STR+17 CritDmg+2%
+14 STR+19 CritDmg+2%
+15 STR+21 CritDmg+3%
+16 STR+24 CritDmg+3%
+17 STR+27 CritDmg+3%
+18 STR+31 CritDmg+4%
+19 STR+35 CritDmg+4%
+20 STR+40 CritDmg+5%

new earrings:
Attack Earring (Adds physical DMG)
Magic Earring (Adds magic attack)
Range Earring (Adds yoyo and bow damage)
Defense Earring (Adds def)

new necklaces:
HP Necklace (adds max hp and resist magic)
MP Necklace (adds max mp and resist magic)
FP Necklace (adds max fp and resist magic)
HP&MP Necklace (adds max hp and max mp, a combination of the hp and mp necklaces without the resist magic)

these new accessorys can be combined to form the following sets:
Set #1
Electricity Ring
Electricity Ring
Range Earring
Range Earring
FP Necklace

Effects:
(4/5)
Stop Movement +20% (probably adds chance to root an enemy)
Attackrange+2%
(5/5)
Kill HP +1000 (no clue what this could mean)

Set #2
Water Ring
Water Ring
Magic Earring
Magic Earring
MP Necklace

Effects:
(4/5)
Critical Spellrate +20% (psybomb crit anyone? lolz)
Decrease of magic motion time+20%
(5/5)
Kill MP+500 (no clue what this means)

Set#3
Land Ring
Land Ring
Defense Earring
Defense Earring
HP&MP Necklace

Effects:
(4/5)
HP Recovery+500
MP Recovery+500
(5/5)
Immunity+100

So far I've only seen the new 'instance' mobs drop the new accessories.

They will be obtained on the new instance boss called "Skeleton Devil".
Drop chance of each setpart is 0,03 %.

I can't guarentee that this dropchance will be in final version, I took this information from the TestClient (I gave it to Kurai )

Another information about v15:

There will be Jewel"sets".

If you wear 5 certain jewels (earrings, necklace and rings), you will get some bonus

Example : (All jewels are new!)
Ruby Spirit Ring x2 (Translated, not final name) +
Soul Ring x2 (Translated, not final name) +
Soul Gore Necklace (Translated, not final name) =
HP + 20% (4 Parts)
Reflect Damage +50% (4 Parts)
Block Melee Damage + 20% (5 Parts)

More information :

There will be Guildhousing system.
Dunno so much about it, but i can show you the new Guild Housing furniture

http://img5.imagebanana.com/img/v55v...5GuHoObjs1.jpg
(Premium furniture)

http://img5.imagebanana.com/img/ar8s...5GuHoObjs2.jpg
(Basic furniture)

And here are some objects from the new worlds (Estia Canyon and Dreadful Cave):

http://img5.imagebanana.com/img/1i57...5DreadObjs.jpg
Dreadful Cave objects

http://img5.imagebanana.com/img/u1hb8tl/v15EstObjs.jpg
Estia Canyon objects