I made a simmilar thread here:
https://www.dakkadakka.com/dakkaforum/posts/list/768417.page also touching on the new adjustments to the terrain dataslates.
All in all I think these changes are great, as terrain has been pretty much a non-factor for all of 8th ed. Playing with these rules should add some nice tactical variability to matches, so you wont just have to compare army lists and predict the outcome.
In addition to the core
COD rules, I think the warlord traits, stratagems, missions, and battlezones are also all pretty great. The stratagems help to balance out some of the extremes with things like siege shells, grappling hooks, and breaching gear. There's enough good stuff there that I wouldnt mind bringing a warlord with +3
CP for
COD strats.
I think I'm in love with the Conflagration battlezone, as it brings a very nice risk/reward to being in cover. If a unit is deeply entrenched, there are stratagems to light their cover on fire and literally burn them out.