Something's afoot: JMS has just tweeted for former Foundation and Netter special effects folk with B5 assets or those who have been doing the 4K renders on YouTube to get in touch with him:
https://twitter.com/straczynski/status/1376029585309978627
Might be jumping the gun to suggest it's to do with a full 4K remaster, but who knows?
(JMS has ruled out it having anything to do with Eaglemoss models, who built their Star Trek ships using CGI reference models, which I have to say has disappointed me a bit, but of course I'd rather it be for an SFX remaster!)