Dear Sir,
I will directly jump up to your question 3, you can very well save up on taxes if you sell the property before July 2016. As per the Income Tax provisions you can either buy a property 2 years after the date of Sale or 1 year before the date of Sale. In your case to utilize that section you have to sell your property before July 2016.
There is no compulsion to repay your Housing Loan, it is up to you to either repay the loan or use it for any other purpose of your choice.
Trust this clarifies your query.
Feel free to get back/ call back for any further clarifications.
Thanking You.
Regards,
Rohit R Sharma
BCOM, ACA, LLB - GEN, CERT. FAFP