Here is a Media invitation to E3 for 2011 from Nintendo of Europe. Notice anything interesting about this invite card? The card's design shows a blue "stream" across the background seeming to suggest that this could be related to Cafe's final name. Nintendo likes to keep secret but they might have let the speculation out of the bag with that one.
I guess that anything is possible at this point and that blue stream could in fact be related to the final name but Nintendo could always choose something different in the end.