Only core components and now a stripped down IDE are open source (core is actually free software IIRC). I will only be impressed if the entire runtime stack becomes open source. Otherwise it's still a platform for DRM or other forms of lockdown.
If you're not porting a .net application to MAC or Linux, I would avoid this for quite a while still. We don't know where this is going long term.
If you're not porting a .net application to MAC or Linux, I would avoid this for quite a while still. We don't know where this is going long term.