SKG The Merlin: Actual rental yield kitna hai?

Visited SKG The Merlin on Saturday, the completed project looks decent. I'm keen on a 3BHK here for investment, already own a 2BHK. Builder sales pitches always show great rental yields, but I'm trying to figure out the real picture. Is anyone getting good rental income from their flats here? Also, for resale, how liquid is this market? My trick is checking nearby rental postings for similar completed projects, but real experiences from owners would be gold. Should I expect good capital appreciation long-term?