A search for upcoming Viz Media titles on Amazon reveals a number of surprises -- specifically, every single title that's on their SigIkki website, save for Tokyo Flowchart, Afterschool Charisma and I Am a Turtle, have their first volumes available for pre-order. (Whatever vague standards they're using to determine print publication is working, I guess?)
The manga industry in North America isn't facing its best times right now. Del Rey is stretching their release of one quarterly volume to every six months for certain series (Alive, Mushi-shi, Nodame). Dark Horse has either put off or outright cancelled various titles (and upping the price while decreasing the book quality of Berserk isn't helpful). Tokyopop maintains near-irrelevancy and degrades their titles more in production.
Considering this, it's either genius or suicidal for Viz to expand their Signature line with continuing premium presentation, along with the already announced thirty volumes of One Piece in six months. Even with well-established and loved titles/creators -- Children of the Sea, Bokurano, Inio Asano, Taiyo Matsumoto, Fumi Yoshinaga, Tsutomu Nihei; One Piece selling consistently well -- this is a big fucking gamble.