This coming December is all about getting new characters! As new players will be able to obtain a total of 4 new characters, while current/returning players will get 2 new ones. This will mean a lot of gems and new cards obtainable from level up rewards, and new skills, possibly creating new playstyles.
[Early Dec] Yami Marik unlock event
Yami Marik will once again return to the game! Available for new players to unlock, as well as bringing a new card that was not seen from the previous event.
"Hmm... Maybe it's time for you to witness this card!"
[Mid Dec] Duel-A-Thon + New Character
Coming in mid December will be an "all new Duel-A-Thon." As stated in the in-game announcements, duel to earn points and you will be able to unlock a new character!
"Try not to scream... A real spook is coming your way!"
[Mid Dec] Yami Bakura (Gate)
The next addition to the Gate will be Yami Bakura! Previously an event exclusive character only. In mid December, he will be available in the Gate for everyone to challenge and unlock!
[Late Dec] New Legendary Duelist
Coming this late December is a new unlockable Legendary Duelist. We are given the hints about the upcoming character and that it's from the "Duelist Chronicles! Battle City", which is from the first generation of Yu-Gi-Oh! and a quote from the character:
"You're all invited to a show... A show of nightmares that is! Let Battle City begin!"
For the start of the new year, Duel Links decides to improve on some features as well as celebrating the 1 year anniversary of their global release.
[Early Jan] New Character
A new character is set to appear this coming early January. Not much is mentioned in the news, but we are given a quote from the character as the hint:
"All I desire... is victory!"
Improvements, Tag Duel Event, and 1 year Annieversary!
This coming January, Duel Links will be celebrating the 1 year Anniversary of Duel Links' global launch. Giving players many gifts and gem giveaways. There are also going to be some planned improvements, as well a "Tag Duel Event" coming this late January.
Planned improvements mentioned in the notice:
Improvement on Deck Editor screen transitions
Implementation of a button to change between worlds in Duel World
Shut the up going on about obelisk. We’ve literally just got slifer for free. No one knows when the card is coming until it is officially anounced. Going on about how obelisk has a base attack compared to the other two. You look like absolute gimps
Also, you could build a fairly consistent deck for Ra with destiny draw on a LP recovering deck, just add 3 copies of Ra's Disciple, cards like double summon and celestial transformation so you can summon 3 Ra's Disciple and then summon Ra on the same turn.