"My guess is that the chain failed and got caught in the derailleur as it entered the lower wheel. This forced the derailleur to wind up and twist into the spokes and break."
Yes, I have taken the bike to my dealer and this is what we suspect as well.
Let us know how Trek backs you up on this. They have been great to deal with on my MTB but I have not heard anything on the Lemond line.
Unfortunately my dealer says that Shimano will likely not cover this under the warranty..but we are looking into it.
Would Trek be able to do anything in this situation since they didn't make the part?