The issue ones will sell of course, for a few reasons. IT's an issue one and people think it may be valuble. (they won't be, at least, not like people are hoping) It's new and people are checking it out too is if it's any good, and it's has been advertised ALOT so there's that too. So yeah, sales will be good at first.
I personally think the lot of it is utter CRAP and won't catch on. They've changed to many "core" aspects of popular heros that people just won't except it in the long run. And i have a strong suspession they have a card up there sleaves for when that point happens, in the form of a deus ex machania of a little hooded girl that's springing up everywhere. I think, when the sales tank, and people want the "real" heros we've grown to love back, she'll play a part in "fixing" DC. Or at the very least when DC wants to go back to the old numbering scheam to cash in on the big issue numbers they AREN'T going to pass up, like action 900 and such, she'll play a role.
Part of me things this is all just a way for DC to introduce and push a new "ulitmates" line of DC books. *shug* Time will tell. But so far, I hate it.