I think Adonit Pixel support must be the first thing that you will implement in Penultimate. It was hard to believe, that my new pen didn't connect with the app!
It's a shame that evernote doesn't support Adonit Pixel. I was very dissapointen when I receive my Pixel and it didn't connect with Penultimate. It's hard to believe, that the app supports old pens, but not Pixel!