I didn't know there were 4 new rune words...

[Yogi_Baar]

I knew about Splendor, Prudence and Duress, but apparently there's also a new melee weapon runeword:

Wind
2 Socket Melee Weapons
Sur + El

10% Chance To Cast Level 9 Tornado On Striking
+20% Faster Run/Walk
+40% Increased Attack Speed
+15% Faster Hit Recovery
+120-160% Enhanced Damage (varies)
-50% Target Defense
+53 To Attack Rating
Hit Blinds Target
+1 To Light Radius
Level 13 Twister (127 Charges)

Nice of the Arreat Summit to let us know about this.

EDIT: For some unknown reason, Shael Um Thul occupy 4 sockets according to AS. Oh well. At least the variable affix spans are specified (maybe even correctly).

[Samka]

Man, imagine wasting a 'Sur' in that POS...

[adeyke]

EDIT: For some unknown reason, Shael Um Thul occupy 4 sockets according to AS.

It's just another stunning display of the AS's infallibility and impeccable precision ;).

You'll also note that it lists +53 AR for Wind, while the only AR it has is the +50 from the El. Apparently, someone made the Wind in a superior weapon.