Yes. Development of units will be in different phases. Once the construction is over and units handed over, unsold units (to people in the waiting list) can be sold to you after an agreed lock in period. So you will have to wait till then.
No. Colour, finishes, fittings etc are as per standards and specifications approved by the Ministry of Housing & the Supreme Council for Planning. Changing for each customer would not be practical so the clients have taken utmost care in the selection and the developers are committed to assuring the best quality possible. The whole development is closely monitored by the clients.