Yes, everything is pretty much guessing about the DRM/open mode. Although it sounds pretty damn annoying if you completely lose all possible access to paid software if you switch to Developer/Open mode...
And as said in this post by Jolo, they already have working Flash on N9 with Fennec, only thing that might stop it is certification/money. And if it comes as separate "app" through Ovi Store, it probably will be protected...