What does this mean?
Well, until someone creates an image and tests it, we won't know. But don't go assuming that it's unhackable. Also, I'm certainly not going to do it and neither is fattire since we don't want to have to purchase the 8gb nook tablet since it's basically a kindle fire and that's not ok. They should have stuck with the 16gb edition of the nook. Anyway, if you poor saps are willing to just buy the 8gb nook, I say wait until people can verify the image. I however, will not be giving B&N any more money at all.
So, what have we learned?
Don't assume things are unhackable. If they are slightly different, the exact same files won't work. We need to wait for new images for the 8gb version of the nook tablet to be hackable.
1.4.2 is still completely hackable using the sdcard method we have right now to root. It literally will work on every version.
EDIT: DO NOT FLASH 1.4.0 to an 8gb nook tablet. If you do, you're **** out of luck and need to go to B&N. Don't pm me asking for help.