After Vega the next architecture is Navi, we still know little about Navi but the slide reveals this will be the company's first GPU on a 7nm process. AMD also reveals that the yet unnamed architecture after Navi will be fabbed on a 7nm+ process.
Moving on to the CPU roadmap we can see it looks very similar. The currently available Zen processors are made on a 14nm process and AMD plans to offer 14nm+ versions too. The next-gen Zen 2 architecture will use 7nm and the future Zen 3 will be on the 7nm+ node.