If it is decided to always show dice-type as part of unit info (as this is currently not shown anywhere easily seen by the player, and as AA units may their own dice types, and as these dice types may change during game) it seems to me logical to use the / slash to show dice types in tooltips during play. Like:
+1/6 Bonus attack power from Artillery
Mathematically it reads for example one/sixth attack and that is the actual hit chance.
And yes, att/def info should then not be cramped onto 1 line as using several lines would simply be move readable.
I can see good reasons for displaying the dice types. If AA chances will be displaying dice type, why not also regular game dice. It would spare players and mapmakers from having to go into notes to for info like "This map uses 6 sided dice, and this and that unit type uses this AA dice, until maybe changed by this and that event in game... etc." (Like triggers)
A for how to display values in purchase, I really like Hepps separation line. I think we would be good if we replaced the current purchase info slashes with these separation lines. I think we should stick to very simplifyed unit info display at purchase, similar to the current, as long as tooltips also pop up at purchase.