There’s a good overview in the following paper, that goes over the new work and connects it to the earlier approaches:
In the interest of full disclosure, note that I’m linking the version of the paper where Stephen Muggleton is a co-author. Stephen was my thesis advisor during my PhD so he kindly cited my own work albeit briefly (reasonably so, since it was still in its early stages). There’s a different version of the same paper by the other two authors that skips over my work completely so I didn’t link to it. Politics eh? 
If you want to see where my work on Meta-Intepretive Learning is at nowadays, it’s all here: