I like the idea in principle, however my worry is that lego games have become bloated open worlds with little interesting beyond the main story. That was my main problem with the DC Supervillains game which had both Gotham and Metropolis, making you travel large distances with poor traversal and annoying prerequisites for unlocking characters. The open worlds they build just aren't interesting enough to interact with.
From what people who got to try it out are saying, this open world dwarfs the one in
Arkham Knight. They only got to explore about 10% or so of it, and that was comparable to the full map of that game. As for what they can fill it with, and how interesting... only time will tell.
EDIT: Also, they're sticking to just
seven playable characters (at least for now): Batman (with
100 unlockable Batsuits), Commissioner Gordon, Robin (How many? is the question), Catwoman, Batgirl, Nightwing and... Talia al Ghul?? So I guess the only prerequisite for unlocking them is to encounter them over the course of Batman's life and win them over to your side.
And they're definitely getting the main story right, if this video is any indication: An origin told before in many ways, and this version is both none and
all of them at the same time...
