Just finished the trail, Cumberland to Washington DC, yesterday. No closures...unless you count the Williamsport detour. Not sure about a better detour route in Williamsport, but I thought it was signed pretty well...and I was leading a group of 10...7 of them teenaged boys.
Coming onto Harper's Ferry, where the new surface begins, it is not very well packed. It not only robs you of speed but your tires can slide out...just watch yourself.
All temporary closures from downed trees were open. There are still a couple of temporary bridges or footbridges, but not real issues.
If staying at hiker/biker campsites, most tended to be fairly over grown.