Changes from 1st September 2020

As per new SEBI rules what will be change from 1st September 2020 ? I read many posts, but different post saying different information. 

BTST allowed ? If allowed can need more money ?

To sell holding stocks can we need to wait T+2 days ?

To sell holding stocks can we need maintain extra money ?

Margins will be impact from 1st Sept or 1st Dec ?

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