A 50mm with distagon design... that's pretty unusual. 50mm are usually (modified) planars or tessars, aren't they ? If it could replicate the virtues of the 35/2, I'd really be interested. Night behaviour, in particular...
The weight and size are totally unappealing, and the absence of close focus ability is a pity. Let us however see the pictures first.
The revised macro planar could be more interesting, if it corrects some of the shortcomings of the current one (flare above all things, and vignetting...)