Sounds like a really slowed down version of the Reeve theme.
Yes, undoubtedly. I hope they're not just doing a new arrangement of it for this movie's theme; I like it when new composers get to add to the long tradition of Superman themes (which did not begin with Williams, but with Sammy Timberg and Leon Klatzkin, whose marches Williams was homaging with his own). On the other hand, if they do interestingly different variations on the Williams march like this, that will be an improvement on how John Ottman in Superman Returns just did needle drops, essentially, of the unaltered Williams march every time Superman went into action.