My thinking was that I did not want to delay the beta/stable release if we discovered some issue with a new backend, so it was not included in the beta.
We are working on the 2.2 release now, but I do not yet have a target date for that release. If you need the pCloud backend, you can try out the 2.1.0.108 canary build.
We really appreciate it if you can try the pCloud destination out before we move it to a stable release. There are currently no steps required to switch between the stable and the canary build, so you can download a zip package of the canary and run it locally without messing with your regular installation.