Unfortunately, as of this moment, the DL 50th anniversary celebration includes two new parades (one at each park), a new fireworks show, and some pretty decor. They are updating Space Mountain, and installing Buzz Lightyear too, but they may be open only very late in the celebration unless their construction time tables are accelerated.
What happened? DL has been going through some very difficult times with their management team. People have come and gone, and budgets have either been chopped severly, or spent on things recently that don't seem to be delighting the guests much. The 50th anniversary kind of got buried in all of that chaos.
There is a new team in place, and everyone is very hopeful that positive change is occuring. Buzz was added into the mix by this new leadership, and some older managers have returned either as consultants or in full time roles. Already people are talking about extra maintainence and more guest friendly operations. I cannot comment about that directly because I haven't been back their this year, but there are lots of stories that things are really getting better quickly.
There is still time to "plus out" the 50th anniversary too.