It seems artworks from the Limit Over Collections as well as claimed cards have come out of Chinese new circles. The main reason we bring these up, despite a lack of official confirmation, is that the sources involved also revealed “Dominus Spark” and the new “Kewl Tune” support cards prior to their public unveiling, so it’s worth taking the following into account.

Firstly, three sets of artwork have been shown off:

Chibi style artwork of Ib the World Chalice Justiciar and Mekk-Knight Crusadia Avramax

Chibi style artwork of Super Starslayer TY-PHON – Sky Crisis and Divine Arsenal AA-ZEUS – Sky Thunder

The artwork of AA-Zeus matches the officially revealed artwork for AA-Zeus:

Secondly, the more controversial set of information is five claimed cards, that I will describe, but since the effects of these cards are essentially a game of telephone from what is being claimed by the Korean sources to be Chinese sources, and then us working from Korean to English, please understand specifics cannot be confirmed and/or have been lost with each baton pass between language.

A Retrain of Dark Magic Curtain
Normal Spell Card
It allows both players to Special Summon 1 DARK Spellcaster monster from their Decks, but the Summoned monster cannot activate its effects. Then, if you summoned “Dark Magician” or “Dark Magician Girl”, this card allows you to add 1 card that explicitly mentions the monster you summoned from your Deck to your hand.

Elemental HERO Flame Wingman Remake
Level 6 WIND Warrior Fusion Effect Monster
ATK 2100
DEF 1200
Materials are two monsters with the same Type but different Attribute
Its first effect lets it gains 1000 ATK when it declares an attack and then Special Summons a monster from the hand (a “HERO” monster?)
Its second effect is if a monster is destroyed by battle (unspecified if by itself or just happens in general), you can Fusion Summon using this card (from where is murky).

Cyber Dragon Remake
Level 5 LIGHT Machine Effect Monster
ATK 2100
DEF 1600
First effect allows it to Special Summon itself if you control no monsters
Second effect is if it’s Normal or Special Summoned, you can negate the effects of a card your opponent controls
Third effect is during your Main Phase, you can Fusion Summon a LIGHT Machine Fusion Monster suing monsters on the field as material, including this card.

Synchron Support Trap
Normal Trap Card
Can be activated from your hand if only your opponent controls a monster.
First effect Special Summons a monster from your hand. Then if your opponent controls a monster Special Summoned from the Extra Deck, you can also Special Summon a “Synchro” Tuner from your Deck.
Second Effect allows you to banish this card from the Graveyard to perform a Synchro Summon using monsters you control.

A Rokket/Borrel related Card
Quick-Play Spell Card
Shuffle up to 3 Dragon monsters from your Graveyard into the Deck, then apply effects based on the number returned.
One card lets you Special Summon 1 “Rokket” monster from the Deck with a different name than the cards returned.
Two cards let you recover a Field Spell Card from the Graveyard to the hand
Three cards let you shuffle 3 cards from your opponent’s Graveyard into the Deck.

Source 1

Source 2

Source 3

Original Source seems to be an event from China.