It's hard to discern what not being on a roadmap means in practicality, however. Iris "Pro" may no longer exist, but we also may barely miss it due to continual generation over generation GPU improvements. Alternatively, Intel could be simplifying its GPU lineup. Least likely, but even still a possibility, Intel might only offer Iris Pro GPUs every so many generations. Only after a given process has matured enough to support large, complex GPUs.
Personally, this is a bit disappointing for me. Intel was really closing the gap on Nvidia and AMD. Mobile dedicated GPUs just seem like another point of failure to me.