That’s Rachael Taylor, the somewhat improbable expert Aussie hacker from the first Transformers, whose character name I feel certain you don’t remember, and who saved the world never to be seen again. She’ll probably have a little bit more to do in AKA Jessica Jones, in which she plays radio host Patricia Walker. And since Marvel.com is actually acknowledging that the character became Hellcat in the comics – note that they did not mention Purple Man by his villain name when they announced David Tennant – I’d say there are plans to have her scratch a few people.
I don’t have a particular opinion here – Michael Bay cast her for her looks, but Marvel usually seeks something more. Here’s hoping she has it.