Apple's redesigned, modular Mac Pro aimed at professionals is set to launch in 2019. Apple recently provided this news to TechCrunch.
Tom Boger, Apple's Senior Director of Mac Hardware Marketing, told to a journalist from TechCrunch at Apple Campus: "We want to be transparent and communicate openly with our pro community so we want them to know that the Mac Pro is a 2019 product. It's not something for this year." In addition to transparency for pro customers on an individual basis, there's also a larger fiscal reasoning behind it."
The Mac Pro is still in development, so we will not see it arrive before 2019. No details were given on the shape or internals of the computer.