On September 25, Konami provided information of upcoming events that is scheduled from early October to early November.
[Early Oct] Duel-A-Thon
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.
Return to the duelist kingdom and don't miss out the chance to unlock Yugi Muto!. Announcement has been made that there will be a new card rewards for this event.
[Late Oct] New Playable LD from GX!
A new character in GX World! Vellian Crowler who specializes on mostly machine type monster can be expected to appear Late October, based on the dialogue written "It's my turn to teach you a thing or two about Dueling" is a great hint to expect Vellian Crowler as he is one of the professor being beaten by Jaden in the Academy. Hit the blue button below to learn more about Vellian Crowler
After the success of the first KC Cup last February, KC Cup 2 will be open again. A tournament that offers players to excel and prove their deck worthy of being on the top. KC Cup offers a huge variety of rewards from Legendary Duelists drops.
I have a theory. I think Marik is going to be a Christmas event. What I think is going to happen is 12 days of Marik! Basically, each day comes a Rare Hunter (1st day - Seeker) etc. On the 12th day, you face Marik and win him! Arkana and Lumis and Umbra may also be unlockable. Please subscribe to my YouTube channel at https://www.youtube.com/channel/UCsfoI27eF3yoKg_A9zP3XVw