Yup. Simon Pegg and Nick Frost.
Although it’s not one of their movies; they’re just in Slaughterhouse Rulez. Sony UK, however, is keenly aware that the target audience for this one probably would scratch their heads when trying to recognize the actual stars of the movies, so they’ve made dang sure that you get a good, long look at Pegg and Frost. I suspect that Nick Frost gets it in the neck about a third of the way through and Simon Pegg dies comically ineptly with about twenty minutes to go; but it’s a horror comedy that’s frankly looking mildly iffy, so I can’t blame the studio for front-loading its most reliable stuff in the trailer.
Dunno if it’s making it over here, though. This one’s for the UK horror crowd, apparently. Failing everything else, you’ll probably get to see it at a horror convention in a couple years though.