My guess for what the upcoming update notice will say:
[Early February]
"It's time to..."
A certain character is stronger than ever!
Duel as much as you can to gain points and obtain exclusive Rewards!
"No more Ojamas!"
[Early February]
KC Cup Announcement
The KC Cup is back!
Duel with Duelists around the world and become the very best!
[Mid February]
Obtain a Legendary Duelist
Unlock a peculiarly unique Legendary Duelist in Duel World(GX)!
"....Yes, like fries and ketchup."
[Late February]
A new character is coming to Duel Links!
A certain Legendary Duelist will appear in Duel World!
"If you want a Happily Ever After, you're looking at the wrong Duelist."
[Early March]
An Event Exclusive Legendary Duelist is Coming to the Gate!
Both new players and players who missed out on unlocking the event exclusive Legendary Duelists before will now be able to challenge and unlock them at the Gate!
The next addition to the Gate will be Mokuba Kaiba.
In addition, more event exclusive Legendary Duelists will be added in the future.
Further details will be revealed in upcoming notifications.
[Early March]
Obtain a Legendary Duelist
A certain Legendary Duelist who appeared before will soon be unlocked.
"Oooommmmm, I see them, your strategies."
I suppose he's talking about SuperChazz (which is a true event btw), but I don't have any idea on who is the "fries and ketchup" guy. I might risk for Chumley tho.
The "happily ever after" one's probably Blair, who I do feel is fairly likely at some point. (Probably down the line, not in the near future, though.) That being said, I think the descriptions they made up were deliberately overly-cheesy. I don't think this was a serious prediction somehow.