Some articles sharing on the changes in 2019 Masterplan:

2019 Draft Master Plan

Switch between 2014 & 2019 MasterPlan14 to see the changes

https://www.ura.gov.sg/dmp19/maps/?map=sdcp

URA Draft Master Plan 2019: Higher plot ratios in CBD for converting offices to hotels, residences

That change will fall under a new CBD Incentive Scheme that is part of a broader plan to boost the live-in population within the city's central area with a variety of homes and amenities in places such as downtown, Marina South and Rochor to enable more people to live near workplaces and amenities.
The CBD Incentive Scheme will apply to the Anson Road, Cecil Street, Shenton Way, Robinson Road and Tanjong Pagar areas.