According to the Product Availability Matrix (PAM) for Informatica platform 10.2 (see here: PAM for Informatica 10.2 ), DB2 on z/OS is supported up to and including version 12.
This does not apply to i5/OS, just to make sure.
Yes, Power Exchnage 10.2.0 Build V1020_B08_6085968 supports DB2 V12.
In the PAM attached by Nico Heinze, you can refer to the tab "PWX Classic" for complete information regarding the compatibility.
Thank you both, now I see it when I know where to find it. Much appreciated.