When Genn goes into his other form, he loses the rank upgrades bought with Renown. This isn’t so much a problem for his Worgen form, as they simply deal attack damage, apart from the summon, but is very annoying when he reverts back as his abilities now deal pitiful damage compared to everyone else.
I assume this will be a general problem with transformations in the mode currently.
EDIT: just checked and Khadgar’s first ability is also not upgraded (but the others work, because they simply cast the existing abilities, although they show as being Rank 5 still)