I think that the new Nooks can not be soft rooted. The following is from the nookdevs website.
As of right now, Nooks with serial #s starting with 1003 (running firmware 1.4.1) cannot be rooted, and should NOT be attempted. See New_Hardware_Revision for more details
Read more:
http://nookdevs.com/Softroot#ixzz138luKgrF
But if you were to find an older Nook soft rooting works great.