Long way to go on this.

The stem cells made by using no fetal tissue (skin connective cells called fibroblasts which I worked 3 years with, only in chickens) dont necessarily give rise to organs they might want to clone. It is exciting that they can use nonembryonic cells to make what behave like stem cells early on, but later, when the important differentiation occurs... not even close.

Im going to make a prediction. This is going to be very difficult. I think these genes they put in to cause these cells to revert to the stem cell stage do not change already altered crucial genes important in producing, for example, a fully functional liver. I believe that as cells differentiate, some very significant changes occur in the genome that will be very difficult to fix. Lots of splicing and dicing goes on. Very difficult stuff.