Johar, 42, took to Twitter to laud the trailer and the film's director Mohit Suri.
"Saw the compelling and dramatic trailer of @mohit11481's #humariadhurikahani...His command over emotions is unbelievable... Will be out soon," Johar tweeted.
The romantic saga, also starring Vidya Balan, is produced by Mahesh Bhatt's Vishesh Films.
His director daughter Pooja Bhatt, who has seen the rough cut of the movie, also heaped praise on her father and Mohit.
"Had the privilege of watching the rough cut of Humari Adhoori Kahaani...It made me weep!Thank you @mohit11481 & @MaheshNBhatt for this GEM!" she tweeted.