
This plan was reported in the Business Times today, and it is intended to "accommodate new investors like soap and detergent makers at a new value-add petrochemicals corridor shaping up there, as well as other potential downstream parties"

Sources estimate that the reclamation is expected to add some 10 per cent more land to Ayer Merbau, where Singapore's first petrochemical complex, Petrochemical Corporation of Singapore is also sited."
Full article More reclaimed land for new industries on Jurong Island Move comes as Shell ramps up output at its HPEO plant, Ronnie Lim Business Times 16 Nov 10 on wildsingapore news.
Plans to further expand Jurong Island through reclamation were earlier announced in 2009, because 75% of the island's land has already been taken up or reserved by investors. At that time, Jurong Island had more than 90 global petrochemical companies that have invested over $31 billion. These companies make up 80% of Singapore's energy and chemicals industry. The petrochemicals industry contributed 5.3 per cent of the value added to gross domestic product last year.
Here's some maps of Ayer Merbau and Jurong Island I found on the internet.

The Ayer Merbau reclamation is in addition to the already ongoing massive reclamation near Labrador for the Pasir Panjang Container Terminal extension.

Other ongoing works include reclamation at Jurong Island near some last natural sites there. And of course, the massive Tuas reclamation.