The Gotthard tunnel will be a bit of a game changer on times between ZRH Hb and Lugano (more so once the complimentary Ceneri tunnel, and east lake Zug work is completed), with at least hourly services. However, no plans for direct trains from Kloten, so still a change needed at HB for those arriving into ZRH by air.
Also, in the nearer future, the new TILO link direct from Malpensa via Varese to Lugano will also impact on Lugano airport's future development. Malpensa is also now linked by train every two hours to Cadenazzo, with onward connection to Bellinzona, so Malpensa is becoming a more attractive gateway for the Ticino generally.