Dept of Mysteries Veil Room

[abadgerfan2]

No: HPFGUIDX 113579

I imagine the group has discussed the various Dept. of Mysteries 
rooms seen late in Bk 5. Still, my archives search reveals too 
little discussion on the room that intrigues me the most – the one 
with the amphitheatre seating looking down to the stage with the 
veil. You know, the veil behind which Harry and Luna hear whispered 
voices, and through which Sirius later falls, disappearing.  

What actually happened to his body?  The way the book is written, it 
seems clear that the body is nowhere to be seen!

What logical purpose would such a room serve for the MoM?  A stage 
is for performances, and amphitheatre seating is for an audience 
 
what possible uses have been made of this room, is it a means of 
communication between the dead and the living, as we saw from the 
workings of the dueling wands of HP and LV in Goblet of Fire? 

If the dead can still be heard of from their paintings, might this 
stage be yet another means of communication between the living and 
dead? Could this even be some kind of portal that plays a crucial 
role later in the series?

Questions abound. Has anyone uncovered answers, either from other 
portions of the books, or from interviews of JKR herself?  

Educate me, oh wise ones!