@Oconnor Sorry for the massive delay in replying.
There are no plans to update the testing channel for CentOS but once we have our openSUSE variants up to scratch then yes there is hope to re-establish a testing channel but it will break, as advertised, and, as advertised it will be primarily intended for developer / non production use. But we have a number of ‘behind the scenes’ (read infrastructure) changes on going and they need to be fully established before we can get the much missed testing channel back up and running. But it has to be breakable, as advertised, and those choosing to use it will run that risk. At least more breakable than the stable channel anyway 
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Some background to these changes can be had in the “Intro” and “Quick history” sections of our current stable channel ‘changelog’ thread:
Note however that your existing system can still receive all non rockstor package related updates via it’s CentOS upstream repos so do keep putting them in as they arrive (flashing icon left of kernel version in the top right of Web-UI or just via cli ‘yum update’).
Hope that helps.