I beg to differ regarding the "Weapon X" sequences from "X2" covered the origin...we were teased with excellent images through the usage of flashbacks of Logan inside the tank and being laced with adamantium. Stryker made oblique references to knowing Logan sometime in the past. I hardly would consider those to be "covering the Weapon X storyline".
Bryan Singer apparently considered Taylor Lautner for a role in "X-Men:First Class" I think it was Beast but Taylor was unavailable, he went on to say that he's a fan of the actor's work or some such.
The Japan storyline was hinted at the end of Origins and it has been stated by Jackman that that is the direction they intend to take the character in the next movie. I don't have much interest in a sequel except that hopefully Chris McQuarries script is good....I doubt Aronosfky would take on "Wolverine" but he would be a really interesting choice to see what direction he would take the character.