I just got off the phone with the backcountry desk, talked to a real person too ! The burn was set off this morning and the access to upper Subway is CLOSED. The ranger didn't know for how long, a few days at least so Thursday and Friday Upper Subway trips are shut down for sure, need to check back for Sat/Sunday. She did say that Subway from the bottom is OPEN. So those with permits will be able to do the hike up, but not the canyoneering from the top. I asked if any other canyons were closed, she said Telephone Canyon trail (don't know that one) and some hiking trails for maintainance, but that was all.