Not a lot to say about this one, but a few notes:
This is a repurposing of the promo piece for FC, usually captioned "Heroes die. Legends live forever." Clockwise from top left: Green Lantern/Hal Jordan, Superman, Hawkman, Batman, Flash (unclear which one), Wonder Woman. This is also the first official use of Chip Kidd's trade dress for FC, about which there's a pretty interesting interview here.
I'll get to all the Kirby characters when they're introduced in the story proper, but in the meantime, there's always Jack Kirby's Fourth World Omnibus, Vol. 1 as a starting point...
I love the phrase "orrery of worlds." A quick Google search has revealed two earlier uses of it: an 1856 lecture by Joseph Haven on "mental science as a branch of education," and an 1886 sermon called "God's Great Day-and-Night Engine." Both of which are somehow appropriate.
Very interesting commentary from Will Staples here on the Japanese heroes and their roots in actual Japanese media--I'm a little put off by some of the names too. It's worth noting, also, that Super Young Team were first mentioned back in 52 #6, and that "Young Team" is a reference to Glasgow gangs (see also the Mogwai album with that title).
Wow, that sure looks like the Martian Manhunter on fire in the top middle image of pg. 21. And top left image of pg. 22 brings in the gigantic-hand motif that, as commenter I noted in the DCU 0 entry, also looks like it's going to be a part of TRINITY.