On August 25, Konami provided duelists with information on upcoming events that are scheduled from early September till mid October.
A new type of unlock event that is said to be based off the original series. Based on the name this might refer to the Duelist Kingdom arc from the anime and manga. Additionally, we will be seeing a new type of duel and be able to unlock a new playable character, speculated to be Yugi Muto.
Based on the manner of speech written on the text, the new event is most likely a variation of Rex Raptor, similar to how Super Joey was to Joey Wheeler and Elegant Mai was to Mai Valentine. Based on this, he will most likely be a roaming LD with drops different from the usual Rex Raptor.
A new type of event, that has never been released before, seems to be planned for late September.
An update planned early on in October, will be adding many new features to the world of Duel Links including:
Duel-A-Thon will be held again in Early October. During the event period, you will earn points every duel, to fill your "Duel Meter". Gather points every day and get daily rewards, accumulate those points over the course of the event to get even bigger prizes.
Mid-October would be releasing a character "fit for this time of the year", if we are going with characters from the original series only, this almost 100% confirms Bonz as the new unlockable duelist. Adding to this, the dialogue written saying "Dueling me will give you a spook that will put you in your grave", further solidifies the speculation Bonz will be released.