All the Ultimate Comics will ship with their first issue in a polybag. Superficially this is to avoid spoilers, the kind that Marvel give to the New York press the Monday evening before the comics ship.
But both Ultimate Comics: Ultimates and Ultimate Comics: Hawkeye will ship with a "chase" signature in a limited number of copies, hidden by the polybag.
Again, nothing new, both Ultimate Comics Spider-Man #160 and Fantastic Four #588 shipped with certain copies signed by the creators.
Except for Ultimate Comics: Ultimates and Ultimate Comics: Hawkeye, Bleeding Cool understands it will ship with certain copies signed by Stan Lee.
Speculators, start your engines.