I unfortunately haven't seen anything about this either but it's definitely something I'd be interested in learning more about! Let me know if you hear anything. Sorry I can't be much more help.
Thank you for your response!
I have found a work-around to adding a VCF as a downloadable link within an email footer.
Create a contact card for your address, and save as a VCF onto your desktop. Then upload as a file under Images and Files in Design Studio.
From there you can make a snippet and hyperlink to your file. Plug the snippet into your email.
Has been working just fine for me.
Hope this helps!