Thanks to Stephen for the heads up - updated drivers for the 4800 are available at the Epson Australia site.

Stephen reports the Mac version updated from 2.30 to 2.33.

On Windows the driver that ships with the printer is 5.50. On the Epson site the new driver is listed as Printer Driver 5.5bE. The installer says it is version 6.15E. The driver after the update is 5.51.