I'm new here !!!
First, excuse me for my bad english, because i'm French

I have a couple of questions :
1) First, I play with the 3rd editions of blood bowl. I see that a lot of people play with the 4th edition. But i find a lot of 4th edition:
- one in blood bowl mag N°1
- one on bloodbowl.com
- one with some kind of crazy teams like Nippons or Chaos Bastard
- One like the bloodbowl. com but with 4 Wights in Undead team and 4 Blitzers in Dark elf teams
So I want to know wich is the OFFICIAL 4th rules

2) Someone say me that now Undead regenerate on a 4+. Is it true ???

3) Is someone could give me some tactics (offence and defence) for my Undeaed teams (1 vamp, 2 wights, 2 ghouls, 3 zomb, 2 skel)
In advance thanks you