Perhaps one of the only things we can absolutely confirm at this point is Clan War matchmaking improvements and changes.
The developers themselves addressed this at the Clash forums. The August Clash of Clans update aims to fix a few big issues inside the game, one of which is engineered bases and matchmaking. The developers have an evolutionary change that should hopefully fix Clan Wars and give each group an even and fair chance to win. Here's what they had to say:
"We wanted to share with you that we are making improvements to how the algorithm functions in order to address “engineered bases” in the matchmaking feature. This new functionality will take more into account as far as “total weight” is concerned with regards to both defense and offense. What this means for you is that your Clan will be more evenly matched against other Clans that have similar builds.
One of the challenges in creating a matchmaking system is to allow players to retain their creativity in their base design and play style. We wanted to make sure that your strategies are not invalidated; just more evenly matched against others who share your play style."