Booster Gold was given much importance during Convergence, travelling from domain to domain, with a version of himself transformed into the Waverider character from the Armageddon 2001 series from decades ago. An earlier version of Booster has also been appearing in Justice League 3001.
Captain Atom had his New 52 launch title, that was relatively quickly cancelled, but with a version of him ending up in the 31st Century in Legion Lost….
Either way, I hear that both are back on the books for 2016. The question is… which one is meat and which one is potatoes?