first of all: apologies for the late reply!
And for your questions —
1. The EyeX SDK works with X2-30 eye trackers but not with X2-60 devices. However, for analytical applications we recommend the use of the Tobii Analytics SDK. Please see this page for more information.
2. No, because WPF isn’t available on Mono. We are working on an EyeX SDK package for .NET, which will most likely include WPF support, but it’s not ready for showtime just yet.