You can download the new fix pack from IBM site: www.ibm.com/support/docview.wss?uid=swg24031181
Major enhancements in the compatability were added. A key feature is nested collections support. Now you can have nested collection for up to 16 levels. Converting Oracle collection should be a piece of cake now :)
Some new functions are added like HEXTORAW, NVL2 and SUBSTR2
For complete FIX PACK summary, please check http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp?topic=/com.ibm.db2.luw.wn.doc/doc/c0056050.html