Expected tracking and related performance with the updated ATLAS Inner Tracker layout at the High-Luminosity LHC

As part of the ATLAS Phase-II upgrade, the current Inner Detector of the experiment will be replaced with a new all-silicon Inner Tracker (ITk) designed to face the challenging environment associated with the high number of collisions per bunch crossing. Recently, the decision was taken to update the layout of the ITk pixel detector, in particular, to reduce the radius of the innermost pixel layer. This document presents the recent evolution of the ITk design and its impact on the tracking performance, as well as on some representative high- level object reconstruction and identification, including primary vertices, jet flavour-tagging, electrons and converted photons.