I have checked the curtin package on my MaaS server (xenial), it looks like that the latest curtin-common package is 17.1-11-ga4c9636b-0ubuntu1~16.04.1 and the cloud-init is 17.2-35-gf576b2a2-0ubuntu1~16.04.2.
So yeah the status for Xenial is still "Confirmed" as stated here.
I have checked the curtin package on my MaaS server (xenial), it looks like that the latest curtin-common package is 17.1-11- ga4c9636b- 0ubuntu1~ 16.04.1 and the cloud-init is 17.2-35- gf576b2a2- 0ubuntu1~ 16.04.2.
So yeah the status for Xenial is still "Confirmed" as stated here.