In case you've missed it, here's a summary of the Land Use Plan

Percentage of land for housing will be 17%.

According to CIMB, the Land Use Plan was subsequently published. It addresses how Singapore can cope with the 30% increase in population from current levels. Reclamation alone will add 7-8% of land to the current supply of 71k ha. 

Additionally, some 10k ha stock of reserve land (14%) will be tapped while old industrial areas and some golf courses will be recycled to achieve higher land productivity.

The proportion of projected land area to be used for housing, industry and commerce will not go overboard; the percentage of land used for housing will increase from 14% now to 17% in 2030 while that used for industry and commerce will rise from 13%to 17%.

Here's more from CIMB:

There will be emphasis on liveable spaces. The proportion of land used for parks and nature reserves will increase slightly. To alleviate transport infrastructure strain, train lines will expand from four to seven and rail density will rise to 54 rail-km/million population from 34.

The Marina Bay area can support the expansion of the current CBD by another 1m sf but to alleviate the strains of uniform travel patterns in morning and evening peak hours, Singapore will also develop commercial centres in the city fringe and the northern corridor as well as a new southern waterfront city.

The southern waterfront city will be developed at the current site of port facilities which will move to reclaimed land in Tuas (western tip). Housing stock will increase by 700k (+37%) from the current stock of 1.9m homes, of which 200k (+10.5%) will be completed by 2016.