I just got back from my trip June 6-11th and will throw up a full report (with pics) later but wanted to get some pertinent facts out: First avoid the trail from ~1.5 miles N of Clouds Rest to down to the JMT (I'm sure the regulars already know this). This is the heart of the burned area, the soil is extremely loose and dusty, and it's fairly steep. Thankfully I was solo but with a group you'd be breathing ash/dust continuously - think Mordor
OK, now the good: From Tuolumne Meadows to Glen Aulin to May Lake to CR all trails were in good shape. No mentionable blowdowns or mud slogs. The most mosquitoes between Tenaya Lake and the saddle near Sunrise. I didn't have trouble with them elsewhere except my camp in the morning at Sunrise (though the JMT through Long Meadow was fine). The trail from CR to Merced Lake also good except as mentioned above. Merced Lake to Sunrise via Cathedral Creek also good with a couple blowdowns (easily navigated) and a couple tricky creek crossings in the meadow area about 1/2 way up (it was pouring rain). Nighttime temps were in the 30's and low 40's. I never saw frost but was glad I brought the 20 degree bag.
GA and Sunrise outhouses open. May Lake and Merced Lake not. I didn't make it towards Vogelsang as there were heavy thunderstorms in the forecast at the wrong time. None of the Sierra camps are running yet nor are the wall tents up.
One pic, the clouds had just broke and the sun coming out above Glen Aulin:





