There has been mention of both an Xperia 7 and the frequently rumored Xperia ACE IV in a new report about upcoming Sony smartphones. Sony has already released two Xperia devices in 2023 and there are some expectations that at least three more Xperia smartphones are in the pipeline for this year. This unconfirmed list apparently includes a MediaTek Dimensity-powered Xperia phone. https://www.notebookcheck.net/Xperia-7-and-Xperia-Ace-IV-take-prime-position-as-rumors-about-two-new-Sony-mid-range-phones-gain-traction.717047.0.html
I'm pretty sure Xperia 7 will be Japan exclusive, like those Lite models or the Xperia 8.
It will probably be the same design as 10, but with better hardware.
As for ACE, it usually gets released in Summer in Japan, so it might take a while longer until we hear something official for it.