My take on the HSR, RTS and 3rd link project as follows:-
HSR: Improves Najib's prospects with urban voters in KL, Negri Sembilan, Malacca and Johor. The preliminary SG location is Tuas, which would kill the time savings. The rail in SG should be underground and terminate in Marina Bayfront or Tanjong Pagar. If well planned, customs clearance wont be an issue, as noted in today's straits times article for other cities. As this is mainly for business & leisure travel, the best solution is for this to end in the heart of the city.
RTS: Aecom was awarded the project in May and work was rumoured to be completed in Nov'11. Why the delay over the announcement of underground or overhead link then? I feel there are 2 possibilities. First, Najib is waiting for March dissolution to announce the decision. This ties in with Channel 8's report that the decision could be made in 1 mth time. 2nd, Malaysia prefers underground but SG prefers overhead for cost and other consideration (more road linkages can better protect PSA). So both sides have 1 year to negotiate on this.
3rd link: This is the most disappointing development. To ease the causeway congestion, they either need to build extra lanes/booth or create a new link. Currently it takes an hour to clear both sides during peak periods, which is really too long. Hopefully work can commence faster in this aspect....