If I had to guess just by seeing their fighting concepts I'd say Jax, Sindel, Johnny Cage, Sektor, Kabal, Scorpion, Smoke, and Cyrax look like candidates for high tier.
It's way too soon to tell though. Once people could properly test out what these character's are capable of (even the ones in the demo are getting major revamps frame wise) then we could make better assumptions.
The one's I named would be pretty hard to make bad though. In the right hands in looks like their fighting concepts are just tooooo good. But who knows <_<
Jax: Has big damage grabs that he could combo into from little toe pokes. Unblockable ground pounds(but in only three spots like Scorpion's hellfire) that lead into straight up juggles....>_<. Doesn't have problem approaching.
Sindel: Intense fireball game. Low and high fireball. Air fireball. Air fire ball while floating. And her air fireballs are diagonal, and to anyone who has ever played a 2D fighting game with Akuma in it, you understand why diagonal fireballs are pretty amazing. Very long range pokes. Her pokes push the opponent far back.
Johnny Cage: Frame trap whore. It's clear why they didn't give Johnny that many special moves because he is all about his ridiculous frame traps. These kinds of playstyles really tend to be picked up by alot of the pro players in the US and Japan.
Sektor: Even on block some of his normals push the opponent far back. 3 kinds of missles. His uppercut is RIDICULOUS because he could use it as a punisher for everything and anything you miss from mid or long range. His enhanced uppercut is a juggle starter too..... that's just scary. Getting close to a good Sektor is going to be like pulling teeth.
Kabal: His dash is still all that it use to be. It's the ultimate punish tool for mistakes and leads into a juggle. He can't combo into a dash unless the person is already in the air but still, it's beastly fast. His air fireball stalls him in the air and shoots forward so it could be used to bait antiairs then punish, his floor saw looks like a low >_<
Scorpion: His spear is godlike. One spear = one juggle. His combos on the ground could be comboed into a spear.... So basically if he even hits you you're going to get juggled. That's ****ing dangerous. Plus he has an unblockable he could do at three points and his normals are great too. He has a ranged low poke and a ranged mid poke. A damage decrease on him is inevitable from the demo, but still.
Cyrax: Traps. A projectile that leads into a juggle. And still in my eyes the best teleport in the game. He could do the teleport WHILE IN THE AIR and it doesn't attack and it ends up right behind the opponent. He also has a ton of different grabs that have undiscovered properties, but even without them his concept is hella good.
Smoke: Teleports behind you. Has a parry. Has Akuma's teleport. Has a dive kick with a straight down trajectories. His jab is really fast and probably has frame advantage. And his smoke bombs equal a free juggle(but only from three points) and MIGHT be unblockable >_>
Makoto just doesn't exist in SSIV. I'd say Jax, Smoke and Kung Lao are all guys we should keep an eye on for top tier discussion.
Hilde was garbage tier.
Hilde was the best character in the game in SC4 buddy.......-_-
And my main character go figure.