At the end of last night Arrow episode Oliver was stunned to find Laurel alive again in the Arrow bunker. Wendy Merciless claims thats was a posting side effect of Flashpoint, but I don't think so when the season premiered everybody was still mourning for the fallen Canary and just like with Sara's supposed death earlier in the series Quentin found comfort in the bottle because Laurel was dead. I don't think dream verse Laurel from the 100th episode followed Oliver out into the real world so that leaves me belive that this Laurel is the meta human Black Siren who probably due to Flashpoint was never imprisoned in the pipeline prison. She knew about her doppleganger death so she could very easily found stuff about her double personal life to easily impersonation her since Oliver as shown in the sneak peak for the next episode in the new year thinks thats a resurrected Laurel who doesn't have any memory because of how tramuzize she supposedly is. I beg to differ since I remember watching the Vampire Diaries and how Katherine conned everybody in the first season to believe she was Elena which worked so I pretty sure that's what happening here.