This was not addressed in the Patch Notes that I saw, but Solitude and Sunport are both missing from the list of Transmutation Station locations. The rest make sense: 3 alliance capitals plus Eyevea (base-game), Wrothgar (chapter in all but name), and the main towns in all the chapters except those two. This is not a complaint as much as a "I'm really trying to figure out the reasoning behind this." I'm doubtful that it's a Nord thing or an Altmer/Argonian thing, so that leaves more practical stuff like there just wasn't room to fit one in the guildhall or somesuch.
I'm fresh out of outrage, but I could muster up some amused annoyance if required.