So As I posted in my Release Blog entry the new feature in 12.10.FC9 that interests me most is the Smart Trigger functionality.
There is a decent blog post with an example of a Smart Trigger here
What is exciting to me is the ability to implement the Pub/Sub model of event driven programming seamless into Informix code.
Think about something like inventory management. Previously within Informix, you would need to actively poll if you wanted to alert that inventory had fallen below a certain amount, now with this functionality you will be able to be automatically alerted of the event. A very welcome addition to the feature set IMHO.