The Ion Cyclotron Resonance Frequency (ICRF) heating system on JET is currently being upgraded in order to validate new matching concepts in view of coupling ICRF power to ITER plasmas and to further increase the total additional heating power on JET. The present paper reports on first testbed results from the new JET ITER-like antenna, preliminary matching algorithms, as well as on the first use of the newly installed hybrid couplers between two of the existing A2 antennas. Several other on-going improvements, such as improved trip management system, external conjugate-T matching circuit and arc detection systems are also discussed.