Checked free space left on /system partition is ca. 21 MB of 200 MB total size. Contents of /system/app almost the same as in cm-11. It consist of apollo, browser, bluethoot, calendar,camera, gallery, .........WAPPushManager. While /system/app itself occupies 20.42 MB.
Did ART do anything (i.e. "Android is upgrading ##/## ...") ??
Missing my point.
In CM-11, was /system/app/Apollo.apk (BTW, make this a user app!! Also Camera, Gallery, Calendar--install from Play)
In CM-12, is /system/app/Apollo/Apollo.apk , OK
If ART did anything (apparently big IF), what else is there? If Apollo.dex or equivalent gets placed there, well, we know the score! If ART did not do anything, obviously nothing is going to run.