http://www.sbstransit.com.sg/press/2012-07-08-01.aspx
Seems like no one posted about this article about SBST
buying another batch of 1000 buses? It's just in.
"Delivery from as early as Jan 2013"..."comprising 450
award-winning Mercedes Citaro buses and 550 Volvo B9TL Wright
buses.."
"Of the 1000 new buses, 260 will be funded by the Government under
the Bus Services Enhancement Programme (BSEP), while SBS Transit
will fund the (other) 740 buses under its growth and replacement
plans."
This article means:
1) King Longs are not bought by the Govt for SBST after all, so
probably the ones we're seeing is just a trial that was rejected by
SBST totally?
2) Depends on whether you like Citaros or hate it, there's gonna be
more Citaros. Damn. I expect more flamewars here
now.. 
3) The case of more Wrights mirrors the scenario of the VO3xs Batch
1/2/3s in the 90s..except their bodies all look the same. I don't
expect them to change their EDS any further to differentiate the
different batches as of now..
I am really happy about this purchase. At least they are really
buying some decent buses now. 
Looks like does have much variety of buses for SBS part.
Most likely predicted since the 1990s. These 3 brands will dominate
SBST fleet for long, Mercedes Benz, Volvo and Scania.
I still think there's 1 more replacement exercise.. but long
long later... cos fleet size likely expand to 3300
I thought now the expansion of the fleet goes up to 3400 buses...

Unless SBST wants to expand the fleet to 4000 buses. But I
hope next round they can buy about 400 Alexander Dennis Enviro 500
and 200 IrisBus Citelis. 
SBS Transit is simply going to be the first public bus operators
to have the most boring fleet :x
Wait till you see SMRT. Maybe full MAN fleet. 