No, they still get all of the new content. They get it on February according to this:
http://darksouls.jp/pc/scholar_of_the_first_sin_specmatrix.html
We'll be getting all of the important content. And then in April the nextgen version releases on 3 platforms, which contains additional enemy/design changes (probably to account for 6 phantoms in one session), better graphics, and the aforementioned 6player mode.
All of the content that is important is coming for free, and according to the chart it comes Feb 5th for us on 360, ps3, and pc. New lore, npc's, world events (such as the dragons in heide, i believe. hopefully freya's ambush in tseldora becomes a regular playthrough event), expanded story....if theres a new ending and endboss then it's going to be in this 1.10 patch.
Unless I'm mistaking something about that chart, which I don't think I am...
1.10 patch is February 5th for all current gen, as well as a boxed rerelease. It contains all the substantial content for the game.
Nextgen is April. That's new graphics, 6 player mode, and adjustments to design and enemies (Which is vague, but could just mean "We're making everything as hard as the challenge areas) I see it as a Lost Levels version of Dark Souls 2, since the new phantoms would completely change the balance of the game, and the new enemy stuff is probably that as well.