Feedback on the weapons/Observations:
Katana is left behind still, it doesn't really have an area where it shines above an alternative, when held by a character with 16 monk levels or more*.
*Because 16 is where unarmed damage becomes 1d20, and all free monk feats after 16 give both unarmed and katana boosts at the exact same time
Dual Wield:
-Flurry+DualKama beats DualKatana in every situation, it also falls off less than DualKatana against crit immune enemies due to less of its damage being sourced from crits.
-Quarterstaff is the best dual wield option against mid-high AC enemies, by a significant amount
Single Wield:
-Unarmed is always the best when compared to wielding any single weapons and is less crit reliant(A single Katana and Kama both fall off even steeper against crit immune foes and more mobs on Arelith have resistances to it).
What I'd suggest:
-Don't give WF/EWF Unarmed for free. (only EWF is free at the moment I think?)
Monks have enough goodies as is, and having to spend these two feats would give katana their golden zone.
They're worse than unarmed, but they'd be cheaper to get.
Having to spend one pre-epic feat isn't enough to make up for how much better unarmed is.
It's a better damage type, less crit reliant, has higher dps even when crits are factored in, has a free +5 DR pierce, you can always activate flurry of blows against low AC enemies to get even more damage, and you can use stunning fist. Thanks to the new Disciples gloves, you don't even miss out on stats on your gear due to the glove slot being used.
OR
Remove the +2wis granted by the disciple's gloves. The loss in a gear slot to get 2 stat enchantments would add a reason to go katana.
OR
Add a monk based katana. I remember seeing mention of a wakizashi in the update thread, but any mention of it has vanished now.
It'd be hard to do this without invalidating another weapon though:
The best approach here would probably be going for crit based(Keen/MassiveCrits), as this would fall off sharply against higher AC enemies and leave unarmed the better choice, with a single katana being better against low AC enemies.
(Or the other way around- reduced damage from a mastery damask, but higher AB, meaning it'd be weaker against low AC enemies but stronger against higher AC; but not high enough to make dual katana better than QStaff)
If the devs do decide to do this and want a chart with the theoretical weapon's stats just send me a PM.
Sorry for two red lines, that's the apps fault. The top one on the chart is Kama DualFlurry, the bottom one is Unarmed
The app I used doesn't let the chart go above 50 AC, so I lowered the AB to compensate for this. The ABs I inputted into the app are listed below, but for those who don't want to read, it's aproximately 20 points off. (IE, 21 AC on the bottom row is actually more like 41AC)
If my chart theoretically did go higher and I inputted the actual AB, the curves and intersections of the lines would be identical to what's displayed here, only slid over 20 points to the right.

I've used the same relative AB for all of these(since the app I used doesn't chart above 50 AC), so the actual damage per round by AC is incorrect; of larger note though is the curves, as they show what weapon are statistically superior to which in what situation, and these are still correct.
If your AB is 47 and if the chart says WeaponA with 25 AB starts being better than another option once you pass 24 AC, add on 22(25+22=47), meaning it's actually against 46AC that it starts being better.
They are all calculated around:
-Dex Based (14 str)
-Pure L30 Monk, thus having WF, EWF, WS, EWS, ImpCrit
-Minor variations such as drinking a str pot or having higher/lower base Str aren't going to drastically effect the curves. Large variations could(such as being StrBased).
Unarmed:
AB: 25/22/19/16/13
Damage: 1d20+6(EWS)+2(str)+6(DisciplesGloves)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
Crit: 19-20/x2
Unarmed: if rune is used on +1d4
AB: 25/22/19/16/13
Damage: 1d20+6(EWS)+2(str)+6(DisciplesGloves)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)+1d4(Runic)
Crit: 19-20/x2
Katana: -twohand
AB: 25/22/19/16/13
Damage: 1d10+6(EWS)+3(str)+6(MasteryDamask)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
Crit: 17-20/x2
Katana: Dual Wield
AB: 23/20/17/14/11/23/18
MainHandDamage: 1d10+6(EWS)+2(str)+6(MasteryDamask)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
OffHandDamage: 1d10+6(EWS)+1(str)+6(MasteryDamask)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
Crit: 17-20/x2
Quarterstaff:
AB: 25/22/19/16/13/25/20
MainHandDamage: 1d6+6(EWS)+2(str)+6(MasteryDamask)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
OffHandDamage: 1d20+6(EWS)+1(str)+6(MasteryDamask)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
Crit: 19-20/x2
Disciples Kama: Single
AB: 26/23/20/17/14
MainHandDamage: 1d6+6(EWS)+2(str)+7(DisciplesKama)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
Crit: 18-20/x2
Disciples Kama: Dual Wield (the upper red)
AB: 24/21/18/15/12/24/19
MainHandDamage: 1d6+6(EWS)+2(str)+7(DisciplesKama)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
OffHandDamage: 1d6+6(EWS)+1(str)+7(DisciplesKama)+4(PermEssence)+1d6(TempEssence)+5(MonkDamage)
Crit: 18-20/x2