I highly doubt it's going to happen.... had to keep saying this to calm myself down..!! They would've made another article about it, it's such a big thing to happen in the serial and they haven't said ANYTHING about it.
Karthik and Vidya rarely make any interaction with each other, in fact they really never talk, Karthik hates Sindoora, not Vidya!! So it's just completely and totally impossible.