The exact date is not yet clear; @lea_wmde and @bmueller will communicate it. We still can prepare the necessary patch(es) already.
**Community Consensus**: The RevisionSlider is a feature built to fulfill one of the wishes of the German-speaking Community Wishlist of 2015.
More Info in English: https://meta.wikimedia.org/wiki/WMDE_Technical_Wishes#RevisionSlider_.28show_edit_summaries_in_diff_view.2C_navigate_through_diff_pages.29
More info in German: https://de.wikipedia.org/wiki/Wikipedia:Technische_W%C3%BCnsche/Topw%C3%BCnsche#Anzeige_aller_Bearbeitungskommentare_im_Diff_.5BUmfrage_2015.5D
**Background**:
The revision slider is a feature that adds a visualization of all revisions to the compare screen. Revisions are represented as bars on a line and can be selected using two pointers. The revision slider was originally prototyped by the WMF Community Tech team and then handed over to the WMDE TCB team, as it is a solution to fulfill a wish of the German Community Wishlist: https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche_2015/Artikel#Anzeige_aller_Bearbeitungskommentare_im_Diff