Sorry forgot to mention I'm using Dalvik. Never toggled ART at all.
I'm also seeing enormous battery drain. Like took it off the charger 3.5 hrs ago and down to 79% battery w/ 30min of screen on and no heavy usage. BBS and Wakelock Detector aren't compatible with 4.4 yet so I can't drill down to specifics, but the culprit appears to be Google Services.
I did have High Accuracy Location Mode set. I just switched to Battery Saving to see if it makes a difference. Google Location Reporting and History are on, because I find their Google Now integration useful and I'd hate to lose it.
This was a clean wipe from a TW 4.1.2 ROM. Used latest CWM. I did restore some user apps + data from TiBu. I'm considering trying a full wipe and reinstall tonight, or possibly just going back to a 4.3 ROM for a little while. Loving 4.4 but this battery drain has been frustrating.