The promos that are being shown in India clearly states that its starting on May 18th, i.e. next Friday... I hope that it offers some quality singers to listen to...
As for the target audience, I think Gajji knows the pulse of the music lovers for quite long now.. the reason that they would have used lines like 'meri saans ko bhi' is probably because it comes on air after vacating the most popular saas bahu series Kyonki saas... and another popular show Baa, bahu and baby for Friday showtimings... so naturally Star has to entice that particular segment that its going to lose... the rest of the music loving crowd is anyway going to get hooked if its a quality show!
On the contrary, the saas-bahu crowd is the one Star will be relying on to give its show the initial jump-start. Because, initially at least, it's going to be hard to attract music lovers who are already watching SRGMP. Since the saas-bahu crowd was with Star during that time-frame anyway, they would continue to watch Star - so the show will be aimed at them, with the hope that others catch on by word-of-mouth eventually.