I thought we already knew that though? Some of the LTE review/test versions out there are 32GB's aren't they? My assumption has been that, just like the UK, only a 16GB model will be available at launch - with 32GB to be released later down the road.
What's even more confusing is.. Samsung is listing a 16GB LTE version on their Canadian site now, but with expansion up to 32GB via SD card slot? See this the Memory section at the bottom right (not the middle one - which is confusing in itself that there's two):
Calling all possibilities - Galaxy Nexus? - Smartphones - Mobile Phones | SAMSUNG