There is still a change that adult stem cells might work. The problem with this research is that they setup in such a manner that it is sort of bound to fail. I am referring to Proychmal, they are not recruiting any new patients, but existing studies are going forward.
Radical stem cell therapy is the one that is being tried out in Northwestern and other parts of Europe. Where the destroy your old immune systme via chemo and radiation and they rebuild your immune system from the scratch by drawing from your spinal fluids. This is radical and highly experimental with chance of failure that could lead to fatalities.
Otherwise in chrons research, nothing much going on beyond the biologics, which seem to have a lot of side effects anyways.