Other than being interesting, what does this mean? Isn't it hypothesized that earth started out as a methane environment? Does this mean that they are thinking that Saturn might someday be a "living" planet? Is Saturn thought to be a younger planet than earth?
Not Saturn, its moon Titan.
Saturn is a gas giant, probably no solid surface until you get deep enough for pressure to make a solid out of gas.
Theres no way that thing is going to yield a terrestrial environment.
And Titan is almost as bad. Its just too far out from the sun to thaw out, and if it did somehow it is too small to hold a warmer atmosphere - its the size of Mercury.
Whats interesting, think, is that Titan is a sort of frozen specimen of the materials that went into making the solid planets before the sun and higher temperature chemistry changed them.