DPS Professional is no longer available so I'd expect you'd have to go for an Enterprise license upon renewal.
The new contract would grant you access to Digital Publishing Solution (DPS 2015) but you would still have access to the Digital publishing Suite (DPS Classic) until such time it is phased out.
I also found this below - not sure if this is still relevant but you may want to ping that email address. Otherwise request a consultation Adobe | Request for consultation
The general idea - already mentioned in some other posts - is that we will continue to support DPS (2014, Classic) for at least a year after the launch of DPS (2015) but it could be longer.
Hope that helps.