Auto insider @Carmaker1 also said "400Z" was just made up by the media.
https://www.nissanzclub.com/forum/threads/2022-nissan-z-inside-scoop-details-msrp-pricing-packages-power-hp-weight-transmission-more.147/page-6
Some more interior pics of the proto.
https://www.nissanzclub.com/forum/threads/next-nissan-z-will-have-blue-interior-option-like-the-original-240z.154/page-2
Personally I like the headlights. I'm not in love with the Z's bumper either. Maybe it will look better in person, but if that's everyone's main complaint the aftermarket will probably have a simple fix for that.
With the exception of the Z32 the Z has always been a bargain car. MSRP and adjusted for inflation.
2009 Z34: $30,625 = $37,545
2003 Z33: $26,370 = $37,693
1990 Z32: $27,300 = $54,937
1984 Z31: $15,799 = $39,993
1978 S130: $8,878 = $35,813
1970 S30: $3,526 = $23,901...
A $40k starting price for a base model without options doesn't seem outrageous to me.
The "leak" specs doesn't say anything about 0-60 time. The Q60 red sport does it in 4.5 seconds, but that thing is well over 3,800 lbs.