IGN has put up a preview.
EDIT: They also put up a teaser.
Here's a interesting quote about some of the gameplay mechanics.
The game also gives you control of his Tactical Vision and Crippling Strike. If Tactical Vision sounds like Batman: Arkham Asylum's Detective Mode, that's because it is – SEGA freely admits this. Although the presentation of how this mode will be presented for players is still being decided, it's basically going to highlight keys objectives (like things you can interact with to move the level forward), point out threats and shed light on the game's oodles of collectables.
When you're fighting, a segmented meter is filling in with energy. Each complete segment represents a Crippling Strike. These are one-move knockouts that slowdown time and get presented to you in cinematic way. The one working during my demo had Cap throwing one devastating punch into the kisser of his foes, which shattered their little mouth guards and sent their ragdoll bodies flying into walls. The devs are looking into Crippling Throws for Cap's shield, but they weren't up and running yet.
Wonder if they also took the free-flow combat too, because that will be pretty cool.