I need to see the Ware play in question, but the requirements for the new rule are very specific. Below is the official video describing the scenarios. It is not simply "lowering the head" which i fear many are assuming.
http://www.nflevolution.com/article/vid ... 0000229934
"It is a foul if a runner or tackler initiates forcible contact by delivering a blow with the top/crown of his helmet against an opponent when both players are clearly outside the tackle box (an area extending from tackle to tackle and from three yards beyond the line of scrimmage to the offensive team’s end line). Incidental contact by the helmet of a runner or tackler against an opponent shall not be a foul."
In the video distributed by the NFL, three elements must all be present for a flag to be thrown. The player must a.) line up his opponent, b.) lower his head and c.) deliver a forcible blow with the crown of his helmet.