The High Luminosity Large Hadron Collider (HL-LHC) at CERN is projected to provide an integrated luminosity of up to $4000\, \mathrm{fb}^{-1}$ over its operational span, extending beyond 2040.The CMS Phase-2 Inner Tracker, scheduled for installation at the end of Long Shutdown 3, has been designed to meet the demands of the high-luminosity operation. However, despite a careful optimisation for radiation tolerance, the projected lifespan of silicon sensors and electronic components indicates that the modules in the inner regions and some of the auxiliary electronics will not be able to function correctly for the entire duration of the HL-LHC program. Consequently, those components will need to be replaced at least once during the operation.

Currently, more advanced technologies are under development for readout ASICs and data links, for applications in future High-Energy Physics (HEP) detectors. These technologies may offer opportunities to further enhance the performance of the CMS Inner Tracker for the latter half of the HL-LHC program. Two lines of research are being explored: (i) the improvement of the inner regions, to achieve reduced material budget and enhanced tracking performance, and
(ii) the implementation of precision timing in the very forward region to extend the coverage of timing information in CMS up to $\eta = 4$.

Some of the ideas under consideration are presented in this manuscript.