Another Epilogue of Angel Beats To Be Released

According to Dengeki G's Magazine, Angel Beats! Blu-ray and DVD volume 7 will carry an extra anime "Another Epilogue". It's a different version of the epilogue (C part) in the Episode 13.

Source: Scan of Dengeki G's

C part means

the final scene where reincarnated(?) Otonashi and Kanade meet each other.