I personally don't think this study will necessarily find a way to rescusitate a person who has been dead for hours, but it does provide the hospital a body to use. So after the organs have been taken out for donation, I can see people using cell groups from the cadavers to help people who have cancer and other cell problems.
They say(if memory serves) that if a person can get to the hospital within 15 minutes of a heart-attack, they are very likely to live. I think this shows, not the abilty to bring back people hours dead, but those that didn't get there within that time-frame. That is my hope, at least.