The EEC website has shown off multiple new Intel Arc B580 graphics cards. Most of them are from Maxsun, and two come with more VRAM than previously seen on an Arc B580. https://www.notebookcheck.net/Upcoming-Intel-Arc-B580-variant-could-arrive-with-a-serious-VRAM-upgrade.1014403.0.html
It's not really "hefty," it's what a five year old NVidia card had. Its newest version has 32GB, so the Intel part is trailing edge.