Why Windows 10 is not available for Windows enterprise version?

Hi All,

I hope you are fine. I have one doubt. Currently I am using Windows 8.1 Enterprise version.

Microsoft has said Windows 10 is not available for the enterprise version? Anyone know the reason behind this? If yes, please comment here. And please advice me what should I do to get Windows 10? Should I remove my current OS and install new Windows 8.1 ? Waiting for your reply. Trillion thanks in advance.

Kindest Regards
Sibeesh Venu