We really should actually read things. Play.com Live's website is listing Killzone 2 as making an appearance in trailer form at Play.com Live next weekend, although if SCEE's got anything new to show right now we've colouring ourselves surprised for the next year. We'll check with reps tomorrow.
Update: We may have missed this because it wasn't there. As you can see now, Sony's listing for the event simply reads, "GT5 Prologue and more".