Regarding Wales/Brittany:
First off, I think people are underestimating the importance of this for France. France, in the pre-1.04 game, has way too much automatic power over Brittany. They have de jure control over its laws, and I think they may have some sort of claim by virtue of the crown (not sure about that). Why is this wrong? Because the Duchy of Brittany was never -once- a part of the Kingdom of France during this entire period. Brittany avoided Frankish conquest in the 9th century and maintained independence up until the late 15th century, when the crowns of France and Brittany were unified through dynastic union (see Anne of Brittany).
I think the idea here is to separate Brittany a little more from France and to check France's blobbing tendencies.
That said, I'm not sure I entirely agree with the switch from France to Wales. I would prefer if the Kingdom was called "Kingdom of the Britons" or something like that, with some neutrality between Wales and Brittany. However, I think I'd more strongly prefer flexible de jure kingdoms, with Brittany starting in no particular kingdom. Then, through force of power, time, and prestige, Brittany could be incorporated into France, England, Wales, or whoever else was powerful enough to claim them.
Short of flexibility (which is, apparently, being worked upon?), I might prefer giving Brittany its own crown.