Just seen the ep. Registry looks like NCC-2504 to me.
Images: https://twitter.com/markonolan/status/1466689144470523908?s=21
The ship looks like a rectangular engineering hull leading directly into a hamburger-looking saucer. A detached half saucer is around the main saucer. On the secondary hull, one nacelle is above and one below connect via pylons - these are the first pylons we see in Starfleet ships native to the era. Two smaller sections flank the secondary hull, detached. A pair of large, detached nacelles hang below and to the sides.
Looks like NCE to me, not NCC. Maybe they finally decided to reset the registry numbers for new ships rather than continue using horrendously long six-digit NCCs.