It's up now: http://androidtv.news/2016/04/n-developer-preview-2-rolling-nexus-players/
Way to go OP!
There was a really big bug that prevented most video from playing if I remember correctly. So Nexus Player most likely will skip 2 and go straight to 3.
Not an answer to your question, but are there any noticeable differences in the preview? I haven't seen much discussed when it comes to the Nexus Player.
Gimme a few minutes, I'll shoot Sundar a text and see whats up