arXiv:2610.41382v1 Announce Type: new Abstract: Fluid antenna systems (FAS) introduce dynamic positional degrees of freedom (DoFs), extending the spatial domain from a static and discrete resource to a quasi-continuous and reconfigurable design space. This spatial flexibility provides an effective means of alleviating the geometric rigidity and functional conflicts that constrain integrated sensing and communication (ISAC) systems. Against this backdrop, we provide a comprehensive overview of FAS-enabled ISAC, tracing the evolution from theoretical performance limits to practical transceiver architectures. To illustrate the surveyed design evolution, we further propose the fluid antenna multi-mode modulation (FA-MM) framework as a representative case study of multidimensional physical-layer design for FAS-ISAC. Finally, several open challenges are discussed, with emphasis on predictive sensing, adaptive coordination, and secure spatial-state management in future FAS-ISAC systems.