Kain vs. Dante

Telekinesis can't disarm anyone...
It is one thing to move stuff and open locks and operates lever with it (whatever, I've never played Legacy of Kain), but to take something off someone's hand is a very different story, because he will have a very tight grip on it.

So the firearms will definitely be still in the game. Nightmare Beta and Artemis (as they say right now) both shoot homing laser, and Dante carries the Nightmare Beta almost like an arm armor (pretty impossible to loose grip on).

I'd also doubt that Mist would be of any use against Dante. After he has spotted Kain, in order for Kain for effectively use the Mist form is to first get out of the sight of Dante and turns to Mist form. But Dante being the Demon Hunter, and have hunted a huge variety of demon and phantoms, one will assume that he can sense a powerful vampire (or vampire-like thing) far away.

Dante's Magma Drive and Stinger are both guard breakers, and both can be easily followed by a series of attack. (For Magma Drive, Kick13 combo. For Stinger, 5 slash combo or 2 slashes + million stabs.)

And, Dante is familiar with enemy with the ability to teleport. (Despair)

Can't go into details on the DMC3 things yet. Not too sure how they work.