From the research I have done so far it looks like there are no changes to the rating system for coaches from FM08. This means that the 7 star coach attributes still apply as well as the formula for calculating any star rating (which is more useful for lower league clubs).
On the whole it seems that coaching stats are down from where they used to be, but that might just be the demo settings. I'll need to play a little longer to see if they have tightened up the coaching appointments for low league clubs.