Alastair Roberts explains in a video How Should We Understand the People Who Fall Away in Hebrews 6.
Ken Schenck has posted additional installments of his video series on his Hebrews Bible Study:
Week 2: Jesus Fulfills the Story of Salvation.
Week 3: The Supremacy of Christ Should Keep Us Going.
Andreas Köstenberger has a brief series on introductory matters regarding Hebrews. He attempts to answer the following questions:
Who is the Author?
What is the Message?
Who Were the Readers?
Simon Woodman continues his preaching series on Hebrews: The Returning Jesus, based in part on Hebrews 10:24–25, 35–38; 9:26b–28.
Andrew Perriman offers Some notes on Jesus as Son and Wisdom of God in Hebrews 1:1–4.