W Bangkok has now been open for less than a month. The grand opening is currently scheduled for March, 2013. The hotel only has part of the final room inventory available right now i.e. suites are scheduled to be available starting from February 1, 2013. You can read more about my booking dilemma of this hotel here.
I always advise my friends to stay away from newly opened hotels for at least 6 months. Typically, it takes a while for the employees to get up to the SPG program standards and also get to know the property. I was actually surprised how smoothly everything went during my brief stay. Quite frankly, I was expecting the absolute worst.