I'm just worried they won't truly pick and era and will do "close enough" figures instead. The showings so far are in that vein, even though it's just the kids' line. That's not a Rebirth Batman, as the belt and cape are different, but it's "close enough" and matches a lot of the style guides they use for other products like toothbrushes. I'm a stickler for accurate costumes, so I hope they get their reference from the comics rather than from the extremely limited style guide/online files DC sends out to its licensees.
If they do choose an era to focus on in particular, I'd assume they'd go with what's currently represented in the books. But one that might be a hit with a wider group of fans is the style of the revised looks from World's Finest. Dan Mora's Robin is fairly close to the kid version of Robin they already showed, classic with a slight update. Same with his Teen Titans redesigns, and his Batman (yellow oval, but with the extra points from the 89 movie, and an updated capsule belt).
I have high hopes for DC continuity after the New History of the DCU, and am so happy to see most of the Post-Crisis continuity officially back. New 52 was a pretty rough patch, all things considered. I'd want a toyline that reflects this newly revised DCU and makes up for all the weird extra details and costume inaccuracies that didn't seem to both Todd and co.