No, only Action and JL were announced as set in the past. And their solicits mention that, at least obliquely, even with the latest issues - eg: Superman is Metropolis's 'new saviour', the League are 'the not yet world's greatest heroes'.

Which is a bit of an unsatisfying bit of evidence to be sure, but, Detective's a bit standalone, so it's hard to point to anything actually within the text to demonstrate that. However, Batman being publicly active is a significant part, and in JLA everyone thinks he's just a story, which is incompatible with the idea that the mayor's gunning for him as part of his re-election bid.