Daily XP cap doesnt reset each day now regardless of whether you reach it.
As of early this morning, say if you dont reach cap that day, the remaining figure roles over to the next day, and when you hit it, it stays capped until the following day.
For example, we had 98% of L2 done when I logged lastnight, this morning we still had it done. Once we hit 100% of l2, we are done, even though we only are at like 12% of the cap we started yesterday...