When is it being released? If in the fourth quarter of 2012 600k at most, 400k is more probable. It depends on how much Born This Way has hurt her. If first quarter look for Nicki like sales, no one is hear for pop girls in the first quarter no matter who they are.
Around 300K. But, better question do you think she will use another Amazon deal?
The question is whether or not Amazon will use ARTPOP to promote their mp3 service. Gaga didn't have anything to do with that deal, Amazon bought those copies of BTW for the full price from Interscope.
Considering we don't know the album cover, the release date, the sound of the album, any music from the album, or quite frankly anything about it minus the title... it's hard to say I can make any sort of estimate.
Honestly I'm already starting to get kinda tired of the album with about 3 threads per day about it when we only have the name
I'll wait for the single but I'd guess 370k at least