Pricing for Plyxon has been determined at $90 for a single license, or $60 per license if you need multiple licenses. The ordering page is available now and as a trusted forum visitor you can pre-order a license with a 50% discount until May 1, 2024. The final version will be available shortly, make sure you’ll be ready!

https://www.allroundautomations.com/order/?product=Plyxon

For the discount you can use coupon code PLX1FRM50 on the shopping cart page.

Do you need a new registration even if you are a registered user of PLSQL Developer?
Will you need a separate license for the Windows and Mac (or Linux) product?

You will indeed need a new license for Plyxon. PL/SQL Developer licenses will not work with Plyxon.

A Plyxon license can be used on all platforms though.

That's a shame. I doubt my employer will want to pay two licenses, and Plyxon is not yet a replacement for PL/SQL Developer.
It's been fun to follow along in the beta period, but now I'll delete it and go back to clunky old PL/SQL Developer