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I was considering adapting the Leica-M 35mm F/2 Ultron II - its price-to-performance is stellar, but I ultimately chose the new X-mount 35mm f/1.2 Nokton due to overall size, and have been very satisfied.
The X-mount Nokton's optical formula is unique, and not based on the M-mount Nokton.
Perhaps this new rumored Ultron shall be the same - perhaps it will be as performant as the M-mount Ultron II.
Either way, I'm optimistic if this rumor is true, and I think it'll be a great relative value.