Ground overhauling is one of the main things being planned for 2.3 & 2.4. Aside from some unit additions and when we sped it up for 2.15, we've not really change vanilla mechanics aside from adding units as far as ground goes. Part of the overhauling will include rescaling things, but I don't know that we'll quite go for 100% realistic scales, we'll have to see how it impacts gameplay.