Except according to Brian Hibbs, no one is preordering these things and retailers are ordering low because it has a built in "skipability" fro his pull customers. And he is not the only retailer saying they haven't gotten a lot of requests for these. Since shops generally gauge what to order at pulls + x for most books, with x being how many they sell on an average month to walk in customers who don't have pulls and none of these books have a track record to establish x and the pulls are low to non-existent, I can't see retailers going all in to order well on these. Secret Wars tie ins are facing a similar market resistance according to Hibbs, and the two events are presenting a 2-3 month span where shops have no dependable series sales from the big 2 so money will be tight and they have to be very conservative when making orders and avoid risk taking so they don't get caught short on cash flow the months after the events. I think orders are already in for the first month so unless there was already a big push I don't see them being big sellers because the people who have to make that happen (the retailers not the consumers) have already made their decisions and base don that print runs have been set by the publishers. They are also books retailer will be hesitant to go back and reorder because they won't have much of a shelf life after the event itself, so even if there is greater demand than retailers anticipate, there likely won't be significant reorder activity on it that could lead to further printings. 

So it would be nice, but a) Didio has already said they won't be publishing multiple universes and b) I wouldn't hold my breath on sales being good for these because of the way retailers have to make decisions on how much to order before the end customer even has much info to have much of a clue whether they might want these or not and retailers cannot risk the capital to order big without the guarantee of pull sales/pre-orders. 

-M