If you read down a little bit you'll see this... "PTVS is written in a combination of .NET and Python - but with CoreCLR available across all platforms, a lot

If you read down a little bit you'll see this... "PTVS is written in a combination of .NET and Python - but with CoreCLR available across all platforms, a lot of that code can be reused. The way they integrate into the tools may be different, but they can share a lot of common code." So, it doesn't look like it's going to happen until CoreCLR is stable.