This is all but confirmed by Rath!
To quote a post from the Barnmice Forums:
"Totilas'new rider is Matthias Rath. His stepmom, [Ann Kathrin Linsenhoff] bought the rights(!!!) to ride Totilas."
According to Eurodressage, "Close sources report that Linsenhoff apparently came to an agreement with Paul Schockemohle almost two weeks ago."
What does everyone know about Rath? I guess all eyes will be on him now!!