I suspect they'll offer some deal at some point, even if it's only for a week or a month where people can get extra copies for a low price. In any case I went back to 8.1 for now until they iron out the bugs... mostly with runaway cpu usage on certain processes and problems with changing from microsoft account to user, changing passwords, asking for me to reenter my password, etc... also the lack of creative drivers for my sound blaster Z. I decided I was going to make it look like windows 7 so that's what I worked on this afternoon. All done.
I think it's actually a fair deal that they let people continue to use windows 'free' if they are willing to use beta builds going forward.. it gives cheapskates an option besides pirating.