Scientists got a few brief hours worth of data back from Titan's land surface in 2005 when the Huygens probe touched down in an equatorial region of the moon.Now a number of those same researchers are desperate to go back for a longer-lived stay, but to investigate this time the huge pools that contain methane, ethane, propane and probably many other types of hydrocarbon (carbon-rich) compounds.
The Titan Mare Explorer (TiME) has already been under study for about two years. It is envisaged as a relatively low-cost endeavour - in the low $400m range.
It could launch in January 2016, and make some flybys of Earth and Jupiter to pick up the gravitational energy it would need to head straight at the Saturnian moon for a splash down in June 2023...