They only changed to weekly but in these weeklies no more changes (especially for our S5) are made, so no changelog. I think if there will come no more CM12.1 builds - when CM13 is stable enough as daily driver - we will see an official statement, hopefully..
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If you want the latest 12.1 code, you could always build your own. Lots of guides and pre-configured VMs out there to help you.