I wonder why they're trying this on brain-dead patients first.
Nothing to lose.
If your brain is gradually degenerating, a treatment that might fix it or might (say) give you cancer and kill you horribly in short order might well seem like a good deal on balance, but I expect you'd have to think about it. But if you're already brain-dead, nothing this treatment does to you can make things worse.
The question I'd be asking instead is: Why haven't they published their results showing success in (say) rats? Except actually I probably wouldn't bother asking because the chance of this being anything other than bullshit seems so very very small.
Worst case is IMHO that a new person will be created in an old and damaged body.
"... in an effort to revive the brains of those being kept alive solely through life support. Stem cells will be injected directly into the brain..."
More at:
http://news.discovery.com/tech/biotechnology/dead-could-be-brought-back-to-life-in-medical-trial-160503.htm