The work is in progress at the Pentasquare, i usually drive past the site everyday and DHA is clearly working at full speed on the project.
I am pretty hopeful that they will complete the project in near future, however 2018 may be a bit unrealistic, considering that it is a huge project and may take a bit more time than that. A partial completion can be expected in 2018, however 2019 or 2020 will be more realistic time frames for the 100% completion of the project.
Yes this is a good investment , you have to pay the money in installments and in 3 years times when it is complete 100% , you will hopefully get a good price for it.
I can not comment on the price appreciation because that will depend on the quality of construction and amenities provided to the residents.