The plan right now is that as soon as the upgrade kits are on sale the X - 6 kit will be revised and available at the same time. That is, it'll be a running change to the X - 6 conversion kit. What you see on the top of 2wdrc.com, in fact, is Chazz putting together new Bag D's for the revised X - 6 kits.
Now, that said, the shop that's doing the work on the chassis is taking their sweet time about it
, which is the primary reason the kits haven't already been released. If they don't get their act together quickly, we may be forced to release the new parts, and then make the revised X - 6 kits available like a week later. Chazz has been talking/"encouraging" this shop almost daily, so we'll see what happens.