How will playoffs be handled? Could our ranking go down by losing in the playoffs?

All matches in a tournament, including playoff matches, will be calculated the same.  So, the results of all individual sets played during a tournament will be treated the same and calculated as described in earlier answers.  So, a team’s ranking may go down if they lose in the playoffs.  This change will allow the system to operate as it is originally designed.  A team’s rankings will change based on its results in sets/matches against other teams in the rankings.