Q:

What changes to Blinding Barrage, as reflected in the October 2011 errata updates, actually happened?

Listed here it states the Blinding Barrage has had it's damage reduced. On the errata for the Player's Handbook (page 8) as of the October update it states that: 
Blinding Barrage
Page 119: Delete “2[W] + “ from the Hit entry, and
replace “Half ” with “Dexterity modifier” in the Miss
entry.
So my question is as follows: What does Blinding Barrage actually do now as of the October 2011 errata update?

A:

It now does a lot less damage,
From the compendium:

Hit: Dexterity modifier damage, and the target is blinded until the end of your next turn.
Miss: Dexterity modifier damage.

