According to an image from NicaGamerz of an alleged Killzone 3 preview build, the third Helghast murder simulator will allow for split-screen co-op -- a function that previous entries lacked. Sony of Europe gave VG247 an official "no comment" on the possibility, but also didn't deny the rumor. However, earlier this year at E3, president of SCE worldwide studios Shuhei Yoshida spoke to us about Killzone 3's 3D functionality, saying, "We were going to give players two screens anyway, for some mode ... for some gameplay anyway." Split-screen, perhaps? Given that Killzone 3 is a 3D title and its video is already being rendered twice for the 3D effect, the possibility of split-screen is a bit of a given.
As for whether the split-screen will allow friends to take the game online together is unknown, but it seems players will at least be able to shoot up yellow-eyed baddies on a couch together. Let's put it this way: we're giving today's news the "rumor" tag, but calling the possibility "very likely."