In addition to the 521 and 128 EUs confirmed so far, Intel may also look to offer the Xe-HPG DG2 Arc Alchemist GPU in a 448-EU variant. Though the 448-EU variant was spotted long ago in a leak, a recent commit to the opensource Mesa 3D library further confirms that Intel may indeed look to offer a scaled-down version of the 512-EU chip that can possibly take on the Radeon RX 6600 or the RTX 3060 Ti.
https://www.notebookcheck.net/Intel-Xe-HPG-DG2-Arc-Alchemist-with-448-EUs-referenced-in-recent-Mesa-commit-could-potentially-take-on-AMD-Radeon-RX-6600-or-Nvidia-GeForce-RTX-3060-Ti.576669.0.html