Unless I'm reading the WPA website rule page incorrectly:
- fouling while pocketing the 8-ball is loss of game
- fouling while not pocketing the 8-ball is ball-in-hand, but not loss of game
3.8 Losing the Rack
The shooter loses if he
(a) fouls when pocketing the eight ball;
(b) pockets the eight ball before his group is cleared;
(c) pockets the eight ball in an uncalled pocket; or
(d) drives the eight ball off the table.
These do not apply to the break shot.