Intelligent metasurface technology offers a promising path toward building cost-effective, extremely large-scale antenna arrays and on-demand manipulation of wireless environments. Building on this foundation, two emerging metasurface technologies – Stacked Intelligent Metasurfaces (SIM) and Flexible Intelligent Metasurfaces (FIM) – have achieved significant breakthroughs in functional expansion and deployment versatility. SIM takes an innovative approach by creating a neural network-like structure from multiple layers of programmable metasurfaces. This electromagnetic computing framework can handle signal processing tasks directly in the wave domain, thereby achieving the intelligent utilization of the electromagnetic space. FIM has significantly expanded the deployment and application scope of conventional rigid metasurfaces, enabling them to flexibly adapt to any surface shape. It is particularly worth noting that with the introduction of the electromagnetic drive Lorentz force mechanism, FIM with real-time shape control capabilities can significantly enhance the overall performance of wireless communication and sensing systems. In this talk, we will first elaborate on the basic working principles and key implementation technologies of SIM and FIM. We will then conduct an in-depth analysis of specific application cases of these two technologies in communication and sensing application scenarios, before addressing the primary research challenges and opportunities that need to be tackled for successful deployment of these systems in practice.