Two 4k monitors are 16 megapixels. One 8k monitor is 32 megapixels. This is probably 8+8. This is in no way near retina resolution which needs 50+ pixels per degree. If it had two actual 8k screens (64 megapixels) it would be close but that GPU is wildly underpowered for anything close. No mention of eye tracking for foveated rendering. TLDR: Marketing.
All HMDs should have flip up fronts, esp if used for DEV. A shame you guys weren't involved with the PSVR2 (or a revision) with better ergonomics now it's coming to PC too.