Well, some bad news could be that they don't want to get below 483 this time around. See May 6 draw - 534 points which was on Friday (against convention) and previous was 468 April 20 (Wednesday). So next draw might be higher ... [hopefully not] .. cuz I believe they issue a fixed number (range) of invitations ... and the ones below 483 are much higher than that range ...
Unless they're working on getting some changes in place. Last time other than this they made an aberration to the biweekly draw was in December 2015 when the draws were done on Fridays. #justSpeculating