In beta server I'm on PE era, after last merging I have new CE neighbours (as in live servers the merge system doesnt work fine there! LoL)
Well, one of that CE neighbours has attacked me twice, the first attack he was using CE troops and the second one was with PME troops so I've tasted his beautiful assault tanks, CE champion (heavy unit), pretty nice helicopters...but his terrible boost attack as well.
I've checked out his CE city. These are my calcs:
HIS ATTACK BOOST
Aachen at lvl 12 (31%-31%), Zeus at lvl 15 (33%-33%),C. del Monte at lvl 14 (32%-32%)
7 strike team centers (+28 attack), 1 helicopter base (+4 attack)
total attack-defense boost from military GEs = %96-96%
total attack boost from CE military buildings = %32-0%
total attack-defense = 128%-96%
when he attacked me the summary showed was: 103%-95%
(note that his last attack was few days ago, obviously he has built more strike centers)
HIS DEFENSE BOOST
Deal castle at lvl 9 (27%-27%)
9 Watchfires, 1 Tigers Den, Monastry, (0-61 +27 from Deal = 88% defensive boost)
1 air defense factory (0-4 defense)
7 missile sites (0-28 defense)
total defense-attack from defensive GEs and others = 88%-27%
total defense from CE military defensive buildings = 32%-0%
total defense-attack = 120%-27%
when I attacked him the summary showed was: defensive boost 27%-120%
I perfectly know that this info is from beta server and the things and values may change but as we also know, normally the new features 'tested' on beta server are directly implemented (with no changes) on live servers as well.
My opinion: clouds on the horizon.