I suppose the map has been finalised by now...but in the hope it hasn't...

First,a question..what are the current province numbers in the game?
Second..Regarding the British Isles...fair enough that Scotland has 5 provinces under it's cultural umbrella...but...what of Wales?
Wales may be seen as a rebel nation and insignificant...but...for the first 200 years or so of the game..while Scotland was technically a vassal state of England...Wales was oft in rebellion.

Personally..I would like to see...If Scotland get 5 and Ireland 3...Wales also get 3 provinces...North,South and East...North would be Gwynedd which was the heartbase of Welsh resistance.....South Deheubarth...and the East,quite convenient in game terms due to the mountainous division in Wales(In game at least)...Could be the much disputed marches...
The marches were almost constantly at war and many great Lords cut their teeth in battles in this Geography.

With regard to England...I would be hopeful that the team rethink their Geographical mindset and perhaps divide it as follows....Cornwall(Wessex),Kent,EastAnglia,Mercia,Lancaster and York....this gives 6 provinces...with the potential for the quick acquisition of a 7th in the Welsh March..although the march and Lancaster/York would be rebel at the start..to replicate the harrowing that took place,the rebellions and to limit English Power to an extent.
Perhaps some scripted uprisings,if possible,from the Welsh....?

Some may complain there is too much emphasis on England etc. in the Medieval period..but She had a massive influence on it....and the 100 years war is one of the most recognised of all the medieval conflicts...this of course leads us to look at how France and England,and their environs should be divided up...and,although technically,France is outside the scope of this discussion..I shall touch on it...as it goes hand in hand with England due to their rivalry.
Lands on mainland france should try to include,where possible,as may of the following....Brittany,Normandy,Maine,Anjou,Poitou,Guyenne,Gascony,Toulouse,Champagne,Burgundy,Orlean s,Blois....and possibly others...along with some fringe areas that played roles..such as Flanders etc.Perhaps Calais should be included as a small city state..under French control but a goal of the English(granted,lmid-later medieval...but a major event in 100 years war.)