1: of course it will. antec wouldnt screw themselves over by making a completely different panel that doesnt work with their pre-existing p280s.
2: you most likely will have to order one from antec
My concern is that when I have contacted antec in the past they always refer me to their Australian distributor Altech.com who then go on to say they only sell to retailers. Anyone in Australia have experience in purchasing Antec spare parts?
Our major distributor of our Antec products is Altech, hopefully they should have the new P280 White in stock in the near future for you. It's going to be an exciting time for Antec as we will have the White color version of the P280 case.