Paul Smedley has released (12/26/2008) builds of CUPS version 1.3.9, Gutenprint 5.2.3, and Splix version 1.1.1. 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.