The latest i've seen about Powdair is that tickets are due on sale from early May. They now want to use an A319 instead of a Fokker 100. Also Swiss have announced they will resume seasonal flights from LHR-Sion this winter, so don't know how that will affect a potential SEN-Sion route. I guess we'll find out soon one way or the other. It's certainly an ambitious schedule they propose.