Exterior color choices : US vs Canada.
 

According to the two Acura websites, Canadians have one more silver color choice for the full-blown 2012 SH-AWD Advance(Elite in Canada) - "alabaster silver metallic", other than just the "forged silver metallic". However, a sidenote also says that this additional color will be available as of July 2011.

Don't know if it is worth the wait ?

Depends on if it is a variation of baby blue like the US one or a neutral metallic color.

I'm assuming this is the same Alabaster Silver Metallic that is a pure silver that was on the 3G and was on the RL:

http://www.pbase.com/kluken/image/95233852.jpg

The current Forged Siler Metallic is more a steel grey and in some light has a slight blueish hue. My guess is Acura is doing away with pure silvers do allow the grill to contrast better and not clash.