Paul Smedley has released (10/11/2008) a build of CUPS 1.3.9, with Gutenprint 5.2.0 RC1. Also available (6/28/2008) is a CUPS port driver,
which allows interfacing the standard OS/2 printing subsystem with
CUPS. CUPS is the Common Unix Printing System; the goal is to improve
the printing support in eComStation. You can see what printers are
potentially supported; those mentioned as working with CUPS or Gutenprint should work. There is a newsgroup dedicated to discussion and feedback.
Source: OS/2 Warp News and Rumors