I think they reveal another series in another years. 2018 GX 2019 5D 2020 ZEXAL 2021 ARC-V 2022 Vrains. i think, Vrains end 3-4 year, and they add 2023 the new series. (Japanese Konami write, 2018 is a "GeneX" year.) we have 4 not playable character. Yugi Muto, Kaiba Mokuba, Marik Ishtar, Pandora. we have 5 month and 2018. i think they don't add 2018 january the Gx characters.
God cards will be added until the end of 2017. we don't know but. One we know. All series have a new gate, with new packs. 1st series can go to the gate to play Gx characters. (Japanese Konami write it long time ago, and you can see when you go to the event gate.)
in Gx gate, first packs everyone know. E-heros, more ritual support for Asuka, Union support's for Manjoume..card trader with old cards and new cards. events...
We don't have Duke and Tristan, Noah, Espa, Rebecca as well,if you add 'minor' character as Mokuba you would have others too (not to mention important events as Bakura, Pegasus, Paradox) I would only add Yugi and Arcana as playable (even Yami Yugi already has skills for spellcasters so I don't know how useful he would be) But since they made animation for DM i hope they're planing something more
Yes, asuka is alexis. They don't add Duke, i see everywhere and no one "possible" card created what he use. And noone signature card. Tristan idk, but possible. Noah possible, Espa50% to add... or joey/jounochi Lv up reward is jinzo/psicho shocker. Rebecca... hmm idk..
And i think, Aug events: early aug/mid aug possessed joey. You can see in the characters what they will add. And next Ld duelist (not playable right now) Ishtar Marik. And they will add Ld duelists will Playable. I think, next mokuba. In the manga marik stealing mokuba , kaiba shot 1'card (BEWD) and he save mokuba.