One of the most often-cited unwritten laws of Magic design is the rule of three. The idea behind this principle is that something that is done in the first two sets of a block should also be present in the third set. This is a way of meeting players' assumptions and expectations in a healthy way. If this rule isn't followed, it tends to be jarring and feels wrong, since people tend to look for patterns to be completed.
So far, the first two sets of Return to Ravnica block have each had a Dragon creature as their monored mythic rares. Return to Ravnica features attack-happy token generator Utvara Hellkite, and Gatecrash has artifact-stealing alternate win condition Hellkite Tyrant. In other words, there is most assuredly a pattern at work here. And the odds are in favor of the red mythic from Dragon's Maze being another Dragon with Hellkite in its name.
The Return to Ravnica Hellkite is all about combat, generating exponentially more and more massive tokens with every attack, and rewarding you for playing multiple Dragons. It is most definitely a card meant for the Timmy player psychographic. The one from Gatecrash, meanwhile, leans towards the favor of Johnny, with its quirky alternate win ability that screams "build your deck around me." Therefore, the logical assumption is that the one in Dragon's Maze will be something for Spike, just as Magic 2013's Thundermaw Hellkite is.
Here's my best guess:
Manaburst Hellkite 3RR
Creature - Dragon (Mythic)
Whenever a creature you control deals combat damage to a player, you may sacrifice a land. If you do, add RRR to your mana pool at the beginning of your next main phase.
Got your own ideas as to how the red mythic from the next set will turn out? Let me know in the comments!