If Anything they will have shown IshVeer Face off much earlier with Ranveer dropping dead going into a coma or Ranveer see Ishani with Shikhar and get heartbroken. While driving home all that is in his thought is Ishani and he get into an accident and go into a coma. And since they show nothing like that I had the felling he will be back for sure.
And also the latest spoilers about Ranveer saying he miss Ishani to Falguni, Shakti haven't shoot those scenes yet so he has to be back even with copy paste and close up & BD can't work because you need a close up shoot atleast.
So all this been pre planed from much earlier. Shakti interview from when the separation happened said that IshVeer will be back together in 2 months time and the timing is correct as been sharping up to there face off.