I am unsure, but I believe I had read on the mothership or somewhere that Bolas would NOT be involved in the block. I am horrible at find this kind of stuff, but I cannot recall where I had read this. I believe it was from MaRo himself.
Uhh, yeah, MaRo's not always been the best sort of information for this stuff. In fact, I'm pretty sure he's outright lied to us a few times.
Obvious part: Dragon = Niv, MAYBE Bolas, maybe both (Oh god, that fight would be frigging awesome.)
The maze...hmm.
Okay, let's take the 'maze' thing a little less directly. As of right now, there are...four confirmed planeswalkers on Ravnica? Maybe five if someone shows up in Gatecrash as well as Gideon (Large sets normally have two planeswalkers, right?). Anyway, that gives us:
1. Jace
2. Gideon
3. Ral Zarek
4. Vraska
5. Unknown Simic/Grull/mono-colored (I doubt it would be Orzhov as two WB 'walkers in the same standard format would be weird) planeswalker.
This gives us 3, maybe 4, out of 5 planeswalkers with at LEAST one Izzet color involved. Now, assuming Niv is trying to unravel the secrets of the multiverse or something, the hardest would be the planeswalker spark. Now, Ravnica's physical composition is twisted, as is its politics right now. So, the maze could be referring to this fact, and that Niv-Mizzet (Or bolas, I guess...) is luring as many 'walkers (Izzet-related, out of arrogance) to Ravnica as possible in order to study them by aggravating the current situation.
Uhh, yeah, MaRo's not always been the best sort of information for this stuff. In fact, I'm pretty sure he's outright lied to us a few times.
The maze...hmm.
Okay, let's take the 'maze' thing a little less directly. As of right now, there are...four confirmed planeswalkers on Ravnica? Maybe five if someone shows up in Gatecrash as well as Gideon (Large sets normally have two planeswalkers, right?). Anyway, that gives us:
1. Jace
2. Gideon
3. Ral Zarek
4. Vraska
5. Unknown Simic/Grull/mono-colored (I doubt it would be Orzhov as two WB 'walkers in the same standard format would be weird) planeswalker.
This gives us 3, maybe 4, out of 5 planeswalkers with at LEAST one Izzet color involved. Now, assuming Niv is trying to unravel the secrets of the multiverse or something, the hardest would be the planeswalker spark. Now, Ravnica's physical composition is twisted, as is its politics right now. So, the maze could be referring to this fact, and that Niv-Mizzet (Or bolas, I guess...) is luring as many 'walkers (Izzet-related, out of arrogance) to Ravnica as possible in order to study them by aggravating the current situation.
There. Wild theory #1 is out there.