We are planning to start a new projet based on the Lightning UI but we have questions about Servicemax compatibility with this new UI. Thanks for your help
there is a post Is ServiceMax "Lightning-Ready"? from October that Melissa Morgan stated ServiceMax has this on their roadmap. I just posted a question to Melissa for an update
I am currently testing it (SVMX Spring 16 and SFDC Summer 16) and it seems to work pretty well!
I am testing it as well. So far so good! See Has anyone been using ServiceMax with Salesforce Lightning?