I'm a bit skeptical about whether or not Helmut Lang can work as a brand without Helmut Lang (the man) at the helm. True, he won't be coming back to the label because he's at work on HL-Art, but Lang seems one of those brands so tied to the designer that I don't see his fans following a new designer. ESPECIALLY if Lang starts his own new brand, it seems to me as though they will lose their customer base. Lang was always about customer loyalty... people who bought Lang seemed always to return and get a few new things each season (I always looked to Lang FIRST and then saw what others had to offer).
The only thing that I can see working for the new Japanese buyers is something I dread: proliferation of Helmut Lang Jeans to the point of super-saturation and brand image dissolution. Make some quick money off the popularity and excellence of Lang's signature jeans and tshirts. Knock some money off the retail price (they used to be $225, let's make them now $129.95), drop the quality (produce them in China at the Uniqlo factories out of the same denim), put the Lang name on them, and sell them until the name is dissolved.
IF they produce high-quality, expensive collections, who is going to buy them? I'd perhaps be willing to give them a try, but if Lang himself is designing elsewhere, I'm going to save my money for him. He's made me look better than I normally would since high school... I owe him at least that (haha).