HCAR is the Haskell Communities and Activities Report:

http://www.haskell.org/haskellwiki/Haskell_Communities_and_Activities_Report

published twice a year in May and November with updates
on what is happening in the Haskell development world.

The Fedora Haskell SIG has had a regular entry there for since 2008.
The entries are archived here, complimenting the relnotes beat.