From CBM:
There weren't too many big announcements at Warner Bros.' Arrow panel, but they did decide to end it with a pretty big teaser which seemingly indicates that a prominent member of the Bat-Family will soon be making their way to the series in a Felicity-centric episode.
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wait a young batgirl or batgirl her self?
Would this mean they could potentially cross over with Gotham?
It's still odd to me feeling like one of the few people that liked Green Arrow, and now he is a launching platform for all these characters :P
Its not Batgirl.
Oracle is mos tlikely referencing Felicity's role on Team Arrow