Official response from Linn on there forums,
My question on the forum
Will Linn support Roon and implement the SDK???
Response
We would like to support Roon. We’d hoped to do this via Songcast but Roon had problems in their initial attempts at this and have been too busy to go back to it. We’d consider implementing RoonSpeakers but would strongly prefer that Roon publish the specifications for RAAT and allow it to be freely implemented (as Linn have done for Songcast). If the protocol remains private to Roon or is licensed under onerous terms, we’re much less likely to support it.
I can’t find any publicly available RoonReady SDK or RAAT protocol specification so it’s too early for us to consider support yet.
I guess the ball lies at Roon so it seems.
I would appreciate if a Roon representative would respond
Best regards,
Mike