Does GSLV mkII use anothe CE engine? I wonder what is the load for the 2017 mission you mentioned above.
GSLV Mk II uses different kind of Cryogenic engine- CE 7.5 ( which is based on much more complex staged combustion cycle ) that India had long trouble in mastering...and was successfully flight tested last year . GSLV Mk II can carry pay load upto 2.5 ton to GTO which is just near about the pay load decided for Chandrayaan 2. Since so far GSLV had only 1 successful flight with Indigenous cryogenic upper stage ...there will be 2 more GSLV Mk II flights before Chandrayaan 2 mission will have go ahead.
There is possibility that Chandrayaan 2 mission may not happen in 2017 ...for that reason and it may be pushed to 2018 instead.