I quote you section 12 of the Constitution of The Republic of Singapore

Equal protection
12. ?(1) All persons are equal before the law and entitled to the equal protection of the law.
(2) Except as expressly authorised by this Constitution, there shall be no discrimination against citizens of Singapore on the ground only of religion, race, descent or place of birth in any law or in the appointment to any office or employment under a public authority or in the administration of any law relating to the acquisition, holding or disposition of property or the establishing or carrying on of any trade, business, profession, vocation or employment.
(3) This Article does not invalidate or prohibit ?
(a) any provision regulating personal law; or
(b) any provision or practice restricting office or employment connected with the affairs of any religion, or of an institution managed by a group professing any religion, to persons professing that religion.

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Everybody is fair and equal it seems,

So when PM Lee says "Whenever it comes to upgrading between the PAP and the opposition ward, it has to be the PAP first or else how do we explain to voters that they supported us and we did not pay attention to their needs? So that remains the policy. In Hougang and Potong Pasir, I think both Eric and Sitoh have ideas on what they want to do for their constituencies and these ideas include upgrading."

here http://www.channelnewsasia.com/stories/singaporelocalnews/view/198692/1/.html

and SM Goh says :"My own view is Hougang should be upgraded, otherwise another five years, another 10 years, it would become rather derelict compared to other estates in Singapore."

"He is worried that the opposition wards of Hougang and Potong Pasir would be left behind. "
"After that, we got to ask ourselves whether the estate is worthwhile upgrading. I'm talking about Lorong 8. By then, the estate would be around 35 years old and the lease is only 99 years, so economically, is it worthwhile?
"My own view is Hougang should be upgraded, otherwise another five years, another 10 years, it would become rather derelict compared to other estates in Singapore."

here http://www.channelnewsasia.com/stories/singaporelocalnews/view/199982/1/.html

and here http://sg.news.yahoo.com/060326/5/singapore199982.html

it sounded as if the opposition wards will not get any upgrades and will be less likely to be in line for government subsidies