In fact they have been keeping all options open since the beginning of the serial when named it so ambiguously:
"Jassi Jaisi (.....) Koi Nahin". (Fill in the blanks).
(e.g. bachchi, buddhu, chaalak, natkhat, samajhdaar, akalmand, pyaari, businesswoman, beti, dost, premika, politician, confused, thaali ka baingan, unglion pe nachane waali etc.)
Jassi can be whatever the writers/producers/viewers want her to be. They take out chits for an adjective every week and mould the story accordingly.
NOW FOR THE PROMO (Fairly disjointed promo)
Jassi and Armaan are standing in the open somewhere.
Armaan tells Jassi You got your love and Purab and I got Mallika and ...
Jassi is looking a bit sad and upset she looks away
She says/thinks love is such a strange thing, whole world is looking at you while you are in love with Armaan...
Armaan says/thinks Purab Mehra.
Feel free to add to this, since it may not be complete.