That was quite a lot of reading. I got jumped around to 3 or 4 different topics, including ones on the warrior forums.
So if I am not mistaken we can treat this new crit to hit conversion as a constant unchanged value similar to glancing?
Crit Cap = 100 - Glancing - Boss Crit to Hit Conversion - Dodge - Miss
in other words...
Crit Cap = 100 - 24 - 4.8 - ([214 - X] * 0.000305) - ([722 - Y] * 0.000305)
Where X = your current expertise rating and Y = your current hit rating. This is unless you are Combat. If you are Combat and you have the weapon expertise talent the 214 figure should be changed to 132. Also if you are Alliance and you have Heroic Presence (Draenei racial aura) active, then be sure to add 32.79 to whatever hit rating you have.