The first is by Michael A. Schiff from Current Analysis: IBM Launches Informix Dynamic Server 11.5 - originally released to coincide with the IDS 11.5 announcement at the IIUG Conference and provides an analytical summary, with positives and negatives on the 11.5 release.
The second report is by Matt Aslett from the 451 group: IBM's Cheetah 2 Informix database proves that it's good to share. The Strategy section begins with
IBM's initial plan upon acquiring Informix for $1bn in 2001 was to support the customer base and roll the best features into the DB2 product. It didn't count on the loyalty of the IDS users, however, and any suggestions of discontinuing the IDS product were effectively quashed with the release of IDS 10 in 2005.
Hard to disagree with that.