I predict 2.1-3 million. If she couldn't sell 5-6 million with a killer hit like We Found Love, what makes you think she can sell 5-6 million this time around? I see her going on a downwards spiral from here with album sales.
Because all the singles from LOUD were less successful than WFL and that still sold 6 Million
I don't think it's going to open well at all. She hasn't done enough promo nor has she left herself enough time to make up for that.
However it will most likely end up selling more than 90% of other albums that have debuted at #1 in the past year, which quite frankly is more important. #1 albums are becoming less and less relevant in the industry these days.
I'd say somewhere within 3-5 million actual total sales in a year WW.