Death Valley NP maintains a facebook site specifically for road conditions, and is the most up-to-date official source.
Most roads have re-opened at this point. Scotty's Castle, and the road to it, however, probably won't be open until fall 2016 at the earliest.
Having been out there several times recently, I doubt think the wildflower show is going to reach the level of 2005. Should definitely be a good one, though.
"Let it ride / Let it roll / Let it go"