Well no because that's not the point, they're still really just the same cards. The point is that DFCs need their own print so that legit increase the amount of cards in the set for example EMN is 14 Mythics instead of the typical 12 (they increased small sets to 12 instead of 10 a few sets back) and that's actual cards not being silly with backsides.
No. The 14 mythics include the back sides of DFC cards. So it's actually 12 mythics + Brisela and flipside Ulrich.
So for example Gisela and Ulrich are 2 extra Mythics in EMN compared to OGW and Avacyn and others where extra mythics in SOI but in duels that doesn't appear to be taken into account, as we can see we got the same number of mythics in SOI as we did in Origins and BFZ despite SOI having an increased amount.
Wrong again. The card count in Wizards sources always lists DFC cards as two separate cards, but in Duels the two DFC cards are treated as one card when counting cards for packs. So we actually got more mythics in SOI (Arlinn front+back and Avacyn front+back).
So if we go off that then duels EMN isn't likely to take into account that paper EMN has more slots because of DFCs either. On the other hand SOI was 80 packs and that seems like the maximum whereas OGW was 64 packs so it could be possible EMN will be a few more like maybe 66-68 packs.
Nope. Duels EMN will "take into account" the fact that that EMN has more slots since we automatically get the back half of each DFC card we get. I'm absolutely sure we're still getting 64 packs.
No, they don't count as separate cards. MaRo has explained a bunch of times that they count as 1 card and they have their own print run so it increases the amount a bit.
For example BFZ has the usual 15 Mythics and SOI has 18 Mythics not counting the backs of DFCs.
It's also why in paper you have a chance to pull both a normal Mythic and a DFC Mythic in the same pack because the DFCs come off a separate sheet.
The count for rares and such goes up too by the way.
EDIT: Figured I will layout the actual count:
BFZ: Gideon, Kiora, Ob, Dragonmaster Outcast, Greenwarden, Quaratine Field, Waterveil, Drana, Firebird, Undergrowth Champion, Ulamog, Void Winnower, Sower, Sire and Omnath. That's 15.
SOI: Avacyn, Jace, Relentless, Castigator, Hydra, Descend, Startled Awake, Behold the Beyond, Wolf ODB, Seasons Past, Masterpiece, Mindwrack Demon, Arlinn, Nahiri, Sorin, Olivia, Sigarda and Gitrog Monster. That's 18 not even counting the backsides of Avacyn, Arlinn and Startled Awake.
Also the same is for the previous Innistrad block which is how people where able to guess SOI would have 18 mythics to begin with because they already had to do the same with the DFCs in original Innistrad.