Currently upgrading by hand, the deployment script failed for the v1.5 release.
-- update 1 ( 11:57am PDT ):
The upgrade failed, I restored the service with a vanilla v1.5 release candidate and will very soon add the mastodon.host patches back.
I'll keep you posted ASAP.
-- update 2:
The problem with the automatic merge was fixed, we are back on the mastodon.host you're used to. All features that differentiates it from the vanilla mastodon are implemented back !