Doen't look like Sirus is going to have many friends when he gets out. The Order and Dumbledoor seem not to care or racked by guilt. The ministry will want to brush it all under the carpet as quickly as posible. If Sirsus isn't lucky he could find himself locked in the loony ward at St Mungos. Maybe Odysseus could send Narcissa an owl and get her to be on Sirus's side during the trial and hopefully release.
Author's response
I think Dumbledore and the Potters are still in shock over the idea that they could have been wrong about him. We'll see how they react next chapter. BJH