Hyderabad and Chennai every weekend?
If only . . . HYD & MAA are relatively senior, but don't expect many weekends off if junior under JSS (and that goes for any fleet, not just the 787). Lots of reserve at the bottom of the seniority list, which - ironically - can result in nicer trips and bigger blocks of days off than a normal month's roster. If not on reserve, expect to get very familiar with Islamabad, Beijing & Shanghai, plus whatever random destinations the JSS computer spits out.
To be honest though, I can't see many people turning down a DEP offer for the 787 due to the route network.