I reached out to Siglent USA and they said nothing changed other than the case color.
Welcome to the forum.
It was quite evident in late Feb when SDS800X HD, SDS1000X HD and SDS3000X HD were released, all in black clothes, that SDS2000X HD might follow also....then a few spotted updated pictures showing SDS2000X HD in dark clothes too.
It makes perfect sense IMO that all the 12bit models have this point of distinction over their 8bit cousins.