We'll see if one or both of Siliga and Jones are good to go, but I'm guessing they're the first guys out there. Easley might replace Wilfork on obvious passing downs, though. He's probably not ready to play a high number of snaps yet (and, taking a page from Seattle's book, it's good to have a stable of defensive linemen who can play 40-60% of snaps a game rather than a couple who play 95% like Nink and Jones did last year).
edit: Jones is out, so I'm expecting Wilfork and Siliga to be the starters, with Easley and Vellano playing about 30-40% of the snaps.