It received around three sentences during the keynote address at WWDC 2024.
When you blink, you will miss it: Through a three-word update that was included at the conclusion of Craig Federighi’s talk on the new software, Apple has recently confirmed that RCS functionality will be included in iOS 18. I really wish that this message was longer and contained more information, but they absolutely did not say anything else about it! I guess we will simply have to wait till the beta version of iOS 18 is released to the public.