Q: Does Macbook Pro MD101HN/A support macOS sierra

Yes.

(143108)

macOS Sierra will be available September 20 for download. You could try beta but at this point why bother. Sept 20

macOS Sierra will be available September 20 for download

Could you please post a link with an official announcement from Apple. I cannot find one and, unless there is, we are not allowed to speculate.

Dear babowa,

The 20 September date is at the top of this page:

http://www.apple.com/macos/how-to-upgrade/

They used that darned thin-line gray font again!

Thanks!