Looking at the previous commander sets, especially the last two years (commander 2017 and 2018)here are the following facts chronologically (please forgive me if I don't correctly order the colours in the usual way):
Ravnica set (including angel and demon/devil tribal synergy), still waiting for Bolas/war of the spark set to launch
Modern horizons - Serra Angel card present + that other card that has a cool Phyrexian theme to it
Then probs commander 2019 release
After Ravnica we will have a new plane to go to - probably nordic/vikings themed
After that probably New Phyrexia
Prediction:
Looking at the past it seems we will have a 2mana symbol deck and at least 2 3 mana symbol decks with potentially a 4 or 5 mana symbol deck to complete the 4 decks. We already have had mardu, jund, grixis, bant and esper shards, Jeskai has not received much love in commander formats so I would wager that will be 1 of the decks. After that there could either be Temur or Abzan or potentially 4 or 5 mana decks. No idea what the two mana deck will be (other than not Selesnia or Izzet), hoping for RG Werewolves - one can always dream as it would be very heard to print a commander flip deck for new players who may not use sleeves, what gives me hope is that a nordic theme could easily included werewolves.
I would love this new set to be plane focused with a tribal sub-theme, and as the theme could really be anything, I'm happy to speculate on what I hope happens:
Angel Theme likely as we have had the new Serra and strong angel theme in ravnica. Maybe for the innistrad plane. Just as likely a demon/devil theme with rakdos looking sharp - so Orzhov or Rakdos, unless angels get WUBERG
Assuming the next plane will be viking themed I believe that minotaurs will not be included as a creature type as they are very theme specific (unless they are hairy minotaurs in scandanavia. That would be cool).
Phyrexian/Mirrodin theme is possible. BGU at a push BGUW?
Left field plane Green;red and a third colour unless angels get WUBERG
And then a non-plane theme following 2018 commander trend. - is this where Jeskai fits?
I'll be really happy if:
We get a new Sorin card/commander card
They make a viable werewolf commander
Garruk makes his way back
Ammonkhet
Commander 2018
WG : cats
BWR: Vampires
WUBRG: Dragons
URB: Wizards
Ixalan (with WB vampires and UG Merfolk)
Dominaria (with Wizards)
Commander 2018 - planeswalkers
UR: Artifacts
GBR: Land matters
UGW: Enchantments (with merfolk commander option)
BUW: Top deck matters (with esper zombie commander)
Ravnica set (including angel and demon/devil tribal synergy), still waiting for Bolas/war of the spark set to launch
Modern horizons - Serra Angel card present + that other card that has a cool Phyrexian theme to it
Then probs commander 2019 release
After Ravnica we will have a new plane to go to - probably nordic/vikings themed
After that probably New Phyrexia
Prediction:
Looking at the past it seems we will have a 2mana symbol deck and at least 2 3 mana symbol decks with potentially a 4 or 5 mana symbol deck to complete the 4 decks. We already have had mardu, jund, grixis, bant and esper shards, Jeskai has not received much love in commander formats so I would wager that will be 1 of the decks. After that there could either be Temur or Abzan or potentially 4 or 5 mana decks. No idea what the two mana deck will be (other than not Selesnia or Izzet), hoping for RG Werewolves - one can always dream as it would be very heard to print a commander flip deck for new players who may not use sleeves, what gives me hope is that a nordic theme could easily included werewolves.
I would love this new set to be plane focused with a tribal sub-theme, and as the theme could really be anything, I'm happy to speculate on what I hope happens:
Angel Theme likely as we have had the new Serra and strong angel theme in ravnica. Maybe for the innistrad plane. Just as likely a demon/devil theme with rakdos looking sharp - so Orzhov or Rakdos, unless angels get WUBERG
Assuming the next plane will be viking themed I believe that minotaurs will not be included as a creature type as they are very theme specific (unless they are hairy minotaurs in scandanavia. That would be cool).
Phyrexian/Mirrodin theme is possible. BGU at a push BGUW?
Left field plane Green;red and a third colour unless angels get WUBERG
And then a non-plane theme following 2018 commander trend. - is this where Jeskai fits?
I'll be really happy if:
We get a new Sorin card/commander card
They make a viable werewolf commander
Garruk makes his way back