Just a tip, probably obvious, but from experience I say can that: if you work hard to make all your transitions as seamless as possible, this thing will look really good in the end. When all the tiles' borders are obvious it really hurts the overall effect.
A little late for such advice, but . . .
I can already tell this one will be the best out of all 3. Can't wait to see it.
What if there was some interesting way to reveal it? Like a reveal event of some kind. Musicians have listening parties when they drop an album. How about a Hexquisite . . . pixel . . . part?y or something
meh, probably too much work whatever that might entail.