There is one trip that sails out of Singapore already up on the White Manta website. Because of the Labour Day holiday, there is a 4 day trip going to the Acasta Reef area (30 April - 4 May). I'll be on board then. Vincent has only been there a few times because it can't be reached on a two-day weekend. Last time he was there he found some pristine dive sites with outstanding coral, .
I have been to Acasta twice, and we were lucky to see a whaleshark on each trip - The last one I went on, we actually did a night dive with a whale shark above us

And yes Vincent found a very pristine dive site with beautiful soft corals on a the third day (and lots of fish...)