If the actual 4th place has lost all of his 30 games at 0 PvP rating and then won all 137 games after those (just the extreme case, only purpose is to explain) at the end of the season he'll have an higher rating than a player who won 190 games and then lost 24 games in a row before end of season.
The ranks are final, however I agree that a date should be provided before the actual season's ending, I'll make sure to pass that suggestion :)
Ok i understand, i was thinking that is only luck but i was wrong :)
Yeah a date will be nice for the next season !