Wow, I guess I am a bigger fan than I realized. I got sucked into watching quite a bit of it and what I saw was pretty good:
The new stormtroopers marching out;
the new droid showing it was not a CGI effect and bickering with R2D2;
the old and new cast;
Ian McDiarmond (sp)interview including a reading of the emperor from the Shakespearian version of Return of the Jedi;
some cool props and costume,
an interview with the executive producer of Clone Wars and Rebels.
It is going on for three more days from 10:00 AM to 9:15pm eastern time.
Go to Youtube and search for Star Wars Celebration 2015 live to find it.
My kids really got sucked into it too, which is astounding when you consider so much of what they saw was interviews.