As we previously reported, WB's rules regarding sharing characters between the TV and movie universes seems to be relaxed, and in addition to Batman, now Aquaman is rumored for DC TV.
According to The Aquaman Shrine Twitter account, we can expect to see a glimpse of Aquaman in Season 3 of The Flash, which is adapting the popular DC Comics Flashpoint storyline.
It's even possible an announcement could come at this week's Comic-Con, as The Flash will be there along with the other CW shows.
Regarding Aquaman and the use of the same characters (Superman is now appearing on Supergirl), it's been said the reason WB didn't want to share characters (such as Suicide Squad on Arrow) is because of brand recognition -- meaning some fans wouldn't have any idea what characters belong where. I think it's safe to say now that the Justice League has been introduced, that most fans know who Henry Cavill and Jason Momoa is, and will realize the difference between Tyler Hoechlin playing the Man of Steel, and likewise, whoever plays Batman and Aquaman for DC TV.
It's also a safe bet to say that since Geoff Johns' status has been elevated, that things will go a lot more smoother and the use of characters may be relaxed because of his involvement.