Mumbai: Bollywood stars Shah Rukh Khan and Salman Khan have extended their support to "Tum Bin 2", making movie buffs wonder if they are also doing cameo in the upcoming film. The film's director Anubhav Sinha believes in keeping the guessing game on. Asking him about if the stars will appear in the film, Sinha says "you never know". After teasing their fans with their joint stint in "Bigg Boss" last year, the stars reunited for Baba Siddique's Iftaar party. Now, SRK and Salman came together to launch two different teasers of the Bhushan Kumar's film. This made way for many queries like awill the actors have a special cameo or will they do a special appearance in the promotional song of the film which will feature Akon. Sinha, who made his directorial debut in 2001 with sleeper hit "Tum Bin", wants to keep the surprise element intact. When IANS asked him about the chances of the superstars appearing in the film, Sinha did not confirm or deny any reports. "We knew they were too big...I requested SRK, while Bhushan asked Salman...About cameo I have no idea...It is Bhushan's ambitious project so he might end up pulling this one together. You never know," Sinha told IANS over phone from Mumbai. He added: "We are not talking about it...You are giving us ideas...We never had a discussion about it but you never know." On Wednesday, two separate trailers -- one by Salman and one by SRK -- were launched, and a poll will be conducted on which is a more popular trailer. Shah Rukh, who worked with Sinha in the 2011 science-fiction superhero film "Ra.One", shared "Tum Bin 2 Koi Fariyad" trailer, while Salman shared "Tum Bin 2 Sneak Peak". Shot in the aesthetic landscape of Scotland, "Tum Bin 2" reunites Bhushan Kumar, of the T-Series music label, and writer-director Sinha after a gap of 15 years. Sinha has also co-produced the film along with Kumar. "Tum Bin 2" features Neha Sharma, Aditya Seal and Aashim Gulati.