Rauchbier

The 23mm lens of the X100T results in an angle of view of 63.4°
The 18.5mm lens of the rumored X200 results in an angle of view of about 75° (own calculations)
 
That means that if you take a picture with a 23mm lens things appear about 1.24 times higher (and 1.24 time wider) than if you take the same picture with a 18.5mm lens on the same sensor size (own calculations using tan of half the angle of view).
If you divide 24 megapixels by (1.24 x 1.24) you get about 15.6 megapixels.
That means that the resolution of the X200 using the 23mm digital converter (35mm in 35mm format equivalent) is about the same as the resolution of the original X100T.
 
If you set the digital converter to 33mm (50mm in 35mm format equivalent) the resolution drops to about 7.5 megapixels.
 
Just my 2 cents to the digital converter.

As far as I understood the rumor the lens is 28 mm effective.
That means, that it is a 18.5 mm lens like the lens on the X70.