Hey Geoff,
that's on purpose. John has added a new citeproc in one of the last 
releases. Just use `--citeproc` instead of `--filter pandoc-citeproc`.
Most things should just work as before, some better.
Best,
Denis

Am 06.11.2020 um 08:39 schrieb Geoff Russell:
> Dear JM,
>
> I just installed this .deb file ... and pandoc-citeproc is missing?  
> Is this an omission or has
> something changed?
>
> Cheers,
> Geoff
>
> On Wednesday, November 4, 2020 at 9:15:57 AM UTC+10:30 John MacFarlane 
> wrote:
>
>
>     I'm pleased to announce the release of pandoc 2.11.1,
>     available in the usual places:
>
>     Binary packages & changelog:
>     https://github.com/jgm/pandoc/releases/tag/2.11.1
>     <https://github.com/jgm/pandoc/releases/tag/2.11.1>
>
>     Source & API documentation:
>     http://hackage.haskell.org/package/pandoc-2.11.1
>     <http://hackage.haskell.org/package/pandoc-2.11.1>
>
>     This is another minor release to fix some regressions (and help
>     deal with election anxiety).
>
>     Minor API change:
>
>     Add `PandocBibliographyError` constructor for `PandocError`.
>     (This will help us give more informative error messages
>     when pandoc can't parse a bibliography.)
>
>     Some other improvements of note:
>
>     - Fixed overlong lines in some bibliography styles (e.g., ieee.csl).
>     - Fixed bug in commonmark with footnote extension, whereby
>     nested block-level elements inside a footnote would be rendered
>     in reverse order.
>     - Fixed regression in JATS output when using `--citeproc`.
>     - Improved calculation of table column widths in the LaTeX writer.
>     - Improved treatment of author-in-text citations inside footnotes,
>     in note styles. Rather than putting the bibliographic data
>     in paretheses after the author's name, we now separate it using
>     a comma.
>     - Fixed improper capitalization of "Ibid." and other labels
>     generated by `--citeproc`.
>     - Better handling of inline SVG in HTML.
>     - Refined default CSS for HTML.
>     - Added documentation for pandoc's JATS handling.
>
>     Thanks to Albert Krewinkel, Mauro Bieg, Nils Carlson, and Andy
>     Morris for contributions.
>
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