I don't think that Bolas is behind Niv's disappearance. I think he decided to vanish and leave his guild to Ral until he has figured out what exactly is going on.
I would think that we see some cycles like the Charms or the Signets are probably in there. Then silver splits like Alive // Well.
I would be surprised to see bounce lands, shocks, guildhomes in there... Also I don't think there will be any planeswalker in, even though none of the Ravnica Planeswalker are exactly stellar.
I don't mind that Dimir gets a lot of rehash designs, they are all quite powerful rehashes. Also Lazav really develops to one of my favored characters just from flavor text alone.
Double gates is really quite surprising. But the new gate matter cards actually look interesting.
So we get 1 or 2 lands at uncommon or rare, if something is before the Boros Guildgate. But I would think these would be all new lands. The Gateway Plaza is common much to my surprise.
This is the definition of a feel bad rare.
I would be surprised to see bounce lands, shocks, guildhomes in there... Also I don't think there will be any planeswalker in, even though none of the Ravnica Planeswalker are exactly stellar.
Besides that ... Probably something like Lightning Helix and Shadow of Doubt.
And I do think Selesnya, Boros and Dimir are more or less save.
Dovin Baan in Azorius would just be awesome.
Domri had time to grow up, could have gotten help from Bolas and Grull has good reason to revolt.
I can't imagine Rakdos falling. They are to much focused on, well, Rakdos. Serious he should be an Elder Demon by now.
The Ghost Council is pretty much invincible, but Kaya exist and she is a sell-sword. (I also think she would be a good candidate to turn on Bolas).
And I can't imagine any Simic Walker siding with Bolas.
So we get 1 or 2 lands at uncommon or rare, if something is before the Boros Guildgate. But I would think these would be all new lands. The Gateway Plaza is common much to my surprise.
242:
243: Boros Guildgate
244: Boros Guildgate
245: Dimir Guildgate
246: Dimir Guildgate
247: Gateway Plaza
248: Golgari Guildgate
249: Golgari Guildgate
250:
251: Izzet Guildgate
252: Izzet Guildgate
253: Overgrown Tomb
254: Sacred Foundry
255: Selesnya Guildgate
256: Selesnya Guildgate
257: Steam Vents
258: Temple Garden
259: Watery Grave
How long will it take til it is banned in Commander?