Can someone explain why the delay in the international HTC Butterfly?

One would think that it's a no brainer that it should come out right after they release the DNA? Well maybe not right after in America, but in Europe and Asia, what is happening?

I mean, couldn't they just release the J Butterfly world-wide? What changes are they implementing?

IMO, they are gonna make a grave mistake not releasing this before Sony releases the Xperia Z ((yuga) which looks like a beast phone).