So no final word yet, eh? As I said before, I really don't think Satch has much of a case. That melody sounds like it's been used in hundreds of songs before and the fact that the Coldplay song has lyrics may be enough to differentiate it. I don't know squat about that kind of music trademark/copyright law, though.
EDIT: Listen to this Cat Stevens song. http://www.youtube.com/watch?gl=GB&hl=en-GB&v=uUXda-RTE_c
At 3:15 it has a version of that chord progression/melody in question as well. And I'm sure some other melodist used it before he did. This whole Satch vs. Coldplay is a silly case regardless of how you feel about each artist. That figure's been used in tons of songs.
TANGENT: It's interesting how bands within one genre's umbrella can sound so different; different enough to warrant subgenres. The Arcade Fire, Coldplay, and Sonic Youth are all considered alt-rock (alternative-rock) bands, yet they're all different. Although Suspyre and Suffocation are both metal bands, one is a symphonic/prog metal band favoring soaring melodies and sung vocals; whereas the other is a brutal death metal band favoring skull-crushing riffs and guttural vocals. And metal has so many subgenres, it makes my head spin.