Actually, Set Raj posted the SB story of Pradhyumna here
Pradhyumna wasn't raised by anyone's wife - he was raised by Mayavati, who was none other than Rati. After Kama had been incinerated by Rudra, Rati wanted to give up her life, but a divine voice assured her that she'd get back her husband. She somehow learned that she would find him in Shambara's kingdom, so she took a human form as one of Shambara's cooks, and when Pradhyumna was discovered in that fish, she took him and raised him, and found out from Narada later that he was actually her husband. There was never any marriage b/w them, since Pradhyumna was 'born married'
But so far, Pradhyumna's divine origin as Kama has been totally ignored.
Subhadra - it seemed odd right from the beginning that they never showed her. After all, Dwarka was her maayka, so to never show her, and to just show her when Arjun visits seems pretty odd. But then again, in this serial, there's no Balarama, no Revathy, no Vasudev, no Devaki, no Rohini, no Ugrasena, no Sini, no Satyaka, no Akrura, no Kritavarma, no Udhav (he's again disappeared)... This is one of the worst Krishna serials I've ever seen.
But I actually doubt that they have any plans to do MB again - the last time they showed it, it didn't work for them, and so they came up w/ god knows what - Susheela unhinged, Paundrak, Uddhav & Sudama's quarrel and now this. I'm guessing that next will be Krishna's other marriages? One reason I think that is that already Sachin Verma (Yudhisthir) has got a new assignment - plus after the Pandavas left Ekachakra, they've totally disappeared. This serial has to date resulted in a net win for the Kauravas.
This story is just meandering from track to track. If they do have a serious shortage of actors, maybe they could have just shown the various Krishna & Arjun's adventures (the clearing of Khandavaprastha, Arjun's confrontation w/ Hanuman, etc) rather than all this invented stuff that really makes a mockery of Krishna's character