This seems more like a no brainer than news but it is a tiny bit of new regardless. During her interview with MTV News at San Diego Comic-Con, actor Jaimie Alexander confirmed her return as Lady Sif in THOR: RAGNAROK.
THOR: RAGNAROK is scheduled to start filming in summer 2016 and releases on November 3, 2017.
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Marvel's Phase 3 Production Timeline For DOCTOR STRANGE, SPIDER-MAN, GUARDIANS OF THE GALAXY VOL. 2 & THOR: RAGNAROK