I'm guessing that the likelihood of a BIOS update is similar to the likelihood of the 'renovations' to ModsRigs being completed.
Is there much point 'upgrading' from 13900k to 14900k anyway? Cache and power limits are the same, P-core and E-core count is the same, just the spec clocks are a little higher on the newer CPU, which is relatively easy to achieve with a small manual OC on the 13900K, depending on the individual chip. Other than that, on paper they're almost identical CPU's. Some performance improvements at spec, as you can see in
this review, but otherwise.. meh.
Seems the biggest advantage in EVGA putting out an updated BIOS would be resale value for the motherboard. :)