Tja, das war es dann wohl... Von reddit:
Hello,
We cannot thank you enough for waiting for Rivvr so long. Sorry for a delay, just final touches before starting shipping.
First Rivvr units will be on their way at April 10th.
Thank you for your patience
Best regards,
The Rivvr Team
Stay tuned for more great news! Rivvr Team
Edit: As of 04/11/2018 2038hrs(that's 838pm

PST, no, nothing, nada, zip, incommunicado since 11 days ago. It's the 11th, so soon hopefully.
Edit 2: As of 04/17/2018 2215hrs, PST, no update so far.
Edit 3: As of 04/21/2018 1501hrs, PST, no update so far.
Edit 3: As of 04/24/2018 1529hrs, PDT, no update so far.
Edit 4: As of 05/02/2018 0620hrs, PDT, no update so far.
Edit 4: As of 05/11/2018 1015hrs, PDT, no update so far.
Final Edit: I got an email today and it goes like this.
Hi Backers,
We shipped the first batch of devices as was scheduled, and our users discover a heating problem with the battery after some time.
We recalled all the Rivvr's, and after investigation figured out that we need to change manufacturer. So we are issuing a refund now, and we are sorry to cancel the shipment and your order, but we highly respect your time, plans and expectations.
You’ll get a refund for your order shortly.
Many challenges in the world of producing hardware for us remain unsolved, and we've failed to build Rivvr for wireless VR on time.
For this, we’re deeply sorry.
We are incredibly grateful for your support and trust!
Thank you for your understanding.
The Rivvr Team
That's that and that's it for me. I don't even believe the reason they gave. BS is what it is.