From ZSA CEO Erez Zukerman's blog post titled Hopes and Dreams for 2025:

In terms of hardware, we are working on something exciting for the Voyager. It’s an accessory that’s fully backward compatible with all Voyager keyboards and adds functionality I’m personally very excited about. I'm using it right now (have been for some time) and it's just so good. :) That’s all I’ll say for now.

Prior to this, in August of 2024, Robin Leinonen built a prototype trackpad accessory called The Saucer, and featured it on ZSA's blog. From this blog post:

ZSA might create an “official” Voyager pointing device at some point that might be quite similar to the Saucer!

In October of 2024, Robin also created a DIY Voyager keywell, and featured this on the blog as well.