AMD revealed details about what's going on under the hood of its Ryzen 5 processors. As you may know, the current quad-core, six-core and eight-core Ryzen processors are all based on the same die. The eight-core models are the full versions of the chip whereas the other models are made by disabling cores.
Now Legit Reviews has a bit more details and it seems AMD will disable cores in symmetrical pairs. So you will always have two CPU complex (CCX) blocks with a symmetrical number of activated cores, meaning 2:2, 3:3 or 4:4 configurations. AMD will not ship Ryzen processors with 4:0 or 0:4 configurations.
Here's how the Ryzen lineup looks like, with the three Ryzen 7 CPUs already on the market and the Ryzen 5 CPUs to follow on April 11: