Hi there, my name is ***** ***** I am happy to help you with your question today.
We at Just Answer do not represent Lenovo and are independent computer experts.
That being said, Lenovo does state that the Yoga 2 should be Windows 10 ready for upgrade: (https://support.lenovo.com/us/en/documents/ht103535)
Windows 10 very similar to Windows 8.1 and if you are comfortable with 8.1, 10 is an upgrade I would highly recommend.
Windows 10 has some tutorials for what's new and they are available here for review: http://windows.microsoft.com/en-us/windows-10/support
Let me know if that helps or if I can provide more specific information and you can continue chatting here, otherwise when you are ready you can rate our interaction to close this request,