I was in Death Valley a few weeks ago and met a couple who had flown over from England to find the tree. The guy was wearing a U2 shirt so I asked if that was the reason they were there. It was, and he showed me his pictures.
Apparently, the tube has been replaced by a fairly large green box. There was an Irish flag wrapped around the trunk of the tree (which hopefully someone will remove) and he also said it looks like someone has sawed off a limb. It was hard for me to tell because the pics were on his iphone so they were pretty small so I'm not sure.
I take three or four trips to Death Valley a year but I haven't been to the tree in a long time. Hopefully, as more people make their way out to the site, the area stays intact so fans (who aren't interested in disturbing the area) can enjoy it for years to come.