It is strange that now entering August, the final venue has yet to be made known officially. I mean this is the inaugural year of the Super Series, you would imagine BWF would to end the first year with a big bang with a good show in the SS Final. To do that you need promotion, marketing etc etc and you can't do that with too little time left, especially for the host and organising committee.
Given the SS final is scheduled immediately after the SEA Game held in Bangkok, where the power house of Malaysia and Indonesia, and to some extent the Thailand and Singapore players, will be fighting for the regional glory, their top players will play for sure. If the SS Final venue is far off, it may be disadvantage to these players.
The earlier BWF annouces the venue, the better the preparation will be for the organising committee as well as the players.