I'm sorry, I found no specific references in current materials or the community referencing UltiPro.  My suggestion is during the week, seek out the HR product owner contact in the ServiceNow section of the Expo.  That will be available to you Tuesday - Thursday.  

They may be able to give you a preview of future planned integrations or if not, they are the right contacts to share your use case and convince them it is worth building that integration!