When the model-names A275 and A475 surfaced a few weeks ago, it was mere speculation. Now we have the confirmation: These two models are based on the enterprise ThinkPads of the T-Series and X-Series.
https://www.notebookcheck.net/Confirmed-Lenovo-s-AMD-ThinkPads-A275-and-A475-are-based-on-the-X270-and-T470.240156.0.html