I can't answer your question, but we live in hope. I guess no MP developers who know what they are doing live where MHEG-5 is being used.
I have EPGCollector reading the MHEG-5 data here once a day which creates a TVGuide.xml file which the xmltv plugin reads. But the plugin doesn't read some useful information like program and movie classifications which is a hassle as we have kids. I've brought this up in the relevent forums a few times over the last 4 years but nothing has been done about it.
The plugin also chops off long program descriptions in mid sentence which is annoying.