Note: The following text was originally posted on my X/Twitter account.
The four new anti-ship missiles unveiled at the Chinese military parade appear to be colour-coded, a dynamic that raises questions about the nature of the YJ-19 in particular.
The ramjet-powered YJ-15 supersonic anti-ship cruise missile, the mockups of which notably feature suspension lugs indicative of an air-launched munition, were coloured white in the manner of Chinese air-launched munitions, including known Chinese air-launched anti-ship munitions such as the YJ-83K and YJ-12.
The YJ-17 boost-glide vehicle/hypersonic glide vehicle (BGV/HGV) and the YJ-20 anti-ship ballistic missile, which appear to be intended for launch from the GJB 5860-2006 standard "universal vertical launch system" (UVLS) installed on the PLA Navy's (PLAN) Type 052D-class and Type 055-class destroyers, were displayed in the same light blue colour as the PLAN's existing publicly known ship- and ground-launched anti-ship missiles.
Mockups of the YJ-19, which is best characterized as a scramjet-powered boosted high-altitude cruise missile, were notably displayed in a white, not blue colour. Given how the YJ-19 has a much smaller diameter (including its booster) than the YJ-17 and YJ-20, there has been speculation that the YJ-19 is designed to be launched from a standard 533 mm diameter torpedo tube of PLAN submarines. No suspension lugs can be discerned on the YJ-19 mockups from CCTV's broadcasted footage, but I have not come across overhead imagery of this particular missile (unlike the YJ-15, for which overhead imagery offering a clear view of the suspension lugs is now available). It is worth noting that the torpedoes, both submarine and ship-launched, that featured in the parade were displayed in very different colours from the four newly unveiled anti-ship missiles.