You might recall that Volition was acquired by Deep Silver after the bankruptcy of THQ. You might also recall that Deep Silver are the people responsible for the highly unpalatable severed torso that came packaged with some of the collector's editions of Dead Island: Riptide.
Hence, they will also be responsible for the collector's edition of the upcoming Saints Row IV, which can be voted on by players. Judging from the survey they've posted, the possible collector's edition items for the new Saints Row are more tasteful—which is not to say they don't sometimes err on the ridiculous side. This is the franchise that is known for its giant purple dildo, after all.
So it might not surprise you that some of the options are things like dubstep doomsday buttons, auto tune devices, and presidential briefcases with kinky handcuffs and keys. Less interesting, but still novel options are things like RC helicopters, wood cigar boxes, and a "ridiculously amazing glass display case with lights." Naturally you also have your boring options, like cloth maps—but why would you opt for those sorts of things, really?
If you'd like to see all of the possibilities, check out the survey here.