I understand you are having issues with your Roku premiere. We do not have a time frame to provide you with, as per when the update for the Roku premiere is going to available. For that information it will be best if you contact Roku. Below is a helpful link:
Sling Media Support!
Roku only lists the current up to date software, but I'm assuming it's Slingbox that creates the software and tests the compatibility? Or is Roku responsible for that? There is really no way to get any info from them on the issue.
So I'm assuming I just return the Roku since there's no indication of whether it will supported anytime soon?