On the Netflix side of the MCU, Daredevil season 2 introduced the world to Jon Bernthal as Frank Castle, aka The Punisher.
The photos only show a conversation between the two, where Page could potentially be giving Castle necessary intel.
Since The Punisher is already filming, it will likely come out before The Defenders; although the team up could hypothetically wrap first since it is not a full season (unlike The Punisher).
FirstLook (via MCUExchange) has released new photos from the set of The Punisher that show Deborah Ann Woll reprising her role as Karen Page for the spin-off series.