An interesting supposed fact about methane is that it is basically unstable and breaks down from sunlight. And so its presence means it is somehow being replenished, possibly by lifeforms.
From Universe Today...
“As methane is broken down by light-induced chemical reactions over a timescale of tens of millions of years, it can’t just be a remnant of the atmosphere present when Titan itself was formed, and it must be replenished quite regularly,” said Tobie.
http://www.universetoday.com/8003/the-source-of-titans-methane/
Or some other catalytic reaction?
OK, that actual article posits that Titan has a lot of methane locked in ice.
If sunlight is eliminating Titan’s methane (how? by turning it into elemental carbon and hydrogen?) there is possibly still enough in its ice to keep a substantial presence of this methane at this time.
And so no big shocking news.