Heres probably the best confirmation I could find.

Development has also started on support for QUIC
https://en.wikipedia.org/wiki/QUIC and HTTP/3
https://quicwg.org/base-drafts/draft-ietf-quic-http.html – the next
significant update to the transport protocols that will deliver websites,
applications, and APIs. This is a significant undertaking, but likely to
arrive during the NGINX 1.17 development cycle

From: https://www.nginx.com/blog/nginx-1-16-1-17-released/



On Sat, Jun 1, 2019 at 10:53 PM Mathew Heard <mat999@gmail.com> wrote:

> It is nice to see that confirmation :)
>
> On Fri, May 31, 2019 at 4:54 PM George <nginx-forum@forum.nginx.org>
> wrote:
>
>> Roadmap suggests it is in Nginx 1.17 mainline QUIC = HTTP/3
>> https://trac.nginx.org/nginx/roadmap :)
>>
>> Posted at Nginx Forum:
>> https://forum.nginx.org/read.php?2,256352,284367#msg-284367
>>
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>> http://mailman.nginx.org/mailman/listinfo/nginx
>>
>
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