An emailer points us to a WSJ article talking about the hearing, which talks about defense arguments we hadn't heard before.
[T]he defense plans to present other evidence at the hearing.
The new evidence is expected to include testimony from an expert who contends that the French lab that tested his urine failed to set up the testing machine correctly. It also includes an independent computer analysis of data from the urine test. The Landis team will argue the analysis suggests tampering or a false positive.