Well the XHP35.2 domed ones are same 12V, same rated Vf, same rated amps, so nothing new or better (https://budgetlightforum.com/t/-/52143). If the HI version was 3V and could take very high amps, then it becomes interesting. Something like a SBT90.2 but in a reasonable size package at a reasonable cost.
News on the XHP35.2 HI version in the EOL doc from CREE: https://www.cree.com/led-components/media/documents/CREE-PCN-1058.pdf. Haven't found or seen a spec yet on it though, but if it's like the HD, nothing new, might even be worse.