Movie Master Emerald?

Now that we're able to see the Sonic Movie's beginning, I have an addition to my Easter Eggs list...

The Mater Emerald is clearly visible on the bottom right corner with question marks on it. 

This may further hint a a story with Knuckles, the Emerald's protector. Since Tails is already confirmed, it's possible the next movie will combine Sonic 2 and 3. The Master Emerald has been in a number of other plots (notably Sonic Adventure) so it's possible other elements could be combined as well.

At its bare minimum, it could be a hint at the Chaos Emeralds and/or Super Sonic.

The map also answered one of my questions--Sonic did visit other worlds before Earth, as five are crossed off (six including his home at the center).

Therefore it is possible he already knows Tails or other characters from the other dimensions.

Unfortunately, the illustrations are a bit vague (is that the blue sphere special stage to the right? Are the diamond sparkles purposely similar to Sonic CD's ending? Does the whole rim look like the clock in Sonic Generations?!), so the possibilities are never ending (yes, Sonic Unleashed pun intended).