Is there any ability that is somehow like Defense Matrix fom sc1 ?
And is there something like the Dark Swarm?

No and no.

Edit: Actually, if you are playing 2v2 and you are playing as toss/terran, the toss player can drop a force field on an allied tank in siege mode and no melee units can attack it, so thats kinda like a backwords dark swarm or a half ass defensive matrix, but I don't think its intentional.

- toss sheild ability = dmatrix as stated above (close enough) you can use the immortal's shield sprite, unfortunatley only for ums purposes

-Closest one to swarm would be the ravens point defense drones that block missiles only ; )

Post has been edited 1 time(s), last time on Apr 28 2010, 9:23 pm by Tempz.

More specifically, attacks with an intermediate animation (marine no, but stalker yes)

Wasn't there something stated that all SC1 units would be available for UMS?
If that is still the case, why wouldn't we have those spells?

It's still beta. I'm fairly positive they said that they'd be giving access to everything, like the campaign stuff, on the release date.