ORIGINAL: 76mm
@VPaulus
Thanks for the links to screenshots, those are really helpful. Actually, I don't think that the map and unit graphics are worse than the old version. The GUI in general (menus, etc.) are different and in my opinion a bit worse, but not the end of the world and probably pretty easily fixed (change color scheme, etc.).
But the main thing for me will be game play changes; I'll keep an eye on the Slitherine forum to see what people think.
Can't comment much on the AI but there are some things that I like about the new version.I like how the movement wasn't fiddly anymore since I sometimes accidentally move a unit back and forth when tracing the arrow movement. The other thing that I like is the auto attack for the compulsory attack so you don't have to worry about getting prompted to attack before being able to end your turn.
UI-wise I prefer the older version since the newer one is really a huge step backward. As a beginner I find the old one more intuitive. Also the pace the combat resolves is too fast in the new version to the point that it is hard to follow at times (Sengoku Jidai and Pike and Shot does a good job of showing the results of a melee phase). There are some greyed out options like the AI options for AI personality and handicap in the DAG battle mode. Handicap seems to be not working as of the moment as well on scenario battles. Hopefully the editor will come soon and they fix most problems in the game because I don't want to return to the old one only because of the lack of the vikings.