Check the blog post below for supporting PLSQL procedures within ODI and how you can get 100s of percentage fold improvements;
The OWB to ODI 12c migration utility provides an easy to use on-ramp to Oracle's strategic data integration tool. The utility was designed and built by the same development group that produced OWB and ODI.Here's a screenshot from the recording below showing a project in OWB and what it looks like in ODI 12c;
There is a useful webcast that you can play and watch the migration utility in action. It takes an OWB implementation and uses the migration utility to move into ODI 12c.
It's worth having a read of the following OTN article from Stewart Bryson which gives an overview of the capabilities and options OWB customers have moving forward.
Check it out and see what you think!