I'm considering creating support for pptx PresentationML, either as a separate project (pptx4j), or within docx4j (/src/pptx4j).
Either way, it would be dependent on docx4j, since docx4j contains the openpackaging stuff, and support for drawingML, and I don't propose to move or rename that stuff.
What I'd like to know is, would this be of interest - either to people already working with docx4j, or to people who need to work with pptx files but ...