Patent Application Shows Prime that may be Announced Soon
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The graphics look pretty much like classical Double-Gauss design.
So I wouldn't expect magical resolution numbers from them.
But we know the magic such lenses might have...
I hope that the AF motor is fast enough...
And, @Richard CR, don't you think that 48.6 mm is closer to 50 mm than to 45?
Could also be named 50/1.2, couldn't it? (apart from the rumored name)
This looks considerably more complex than a double Gauss design. (Gauss was a person, thus the capitalization of a proper noun. Double is not.)

Here's the EF 50mm f/1.8 STM with a classic double Gauss design:

For more about what makes a lens a double Gauss, please see Roger Cicala's excellent article:
Why are modern 50mm lenses so damned complicated?
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