I love my new Loxias. They're truly jewels, optically and mechanically. But I don't find MF useful for fast moving situations, so I'm not sure I'd be interested in a longer 135 or 180. CV already has the macro covered... Maybe, like everyone, I'd like to see a redo of the 35 or even the 50.
The Batis 135 is DOA because it is comparable heavy and large. In case Carl-Zeiss would build a Leica APO Telyt M sized lens at 500 g including AF and f/3.4 it would sell like hot cake.
The speed of the Batis 135 was never an issue - the issue is speed vs size and weight.
A Loxia 135 f/3.4 or 180 f/4.0 would be a dream come true for many but I have to admit that the use case is rather limited.
I love my Leica APO Telyt M while traveling but I am not photographing anything in motion - more static things.
For everyone interested in the smallest and lightest possible package for a 135 mm lens is potentially the closed you're going to get at this point in time and maybe for the foreseeable future as well.
Add a light mechanical adapter and you get a sub 500 g 135 f/3.4 at the currently highest optical level. This comes at a price though.
My A7R III remembers the last non EXIF lens and I can switch on IBIS and since it's the only non EXIF lens I own it is also easily traceable in my image library.
Highly recommended and at least on the level of a potential Loxia 135.
I still have the hope that at one day Sigma would revitalize the legendary 180 f/5.6 APO macro in FE mount - this lens had Canon and Nikon mount and AF, was tack sharp and had 1:2 macro - I owned two copies and both were stellar at only 450 g - this was the perfect travel lens. Unfortunately the rubbery surface peels off and got sticky - same thing will probably happen to the rubbery Batis lenses after a decade or two in heavy use.