Apple iWatch rumors have hit the mainstream, thanks to reports from both The New York Times’ Nick Bilton and The Wall Street Journal’s Jessica Lessin, with sources describing “curved glass” “watch-like” prototypes, potentially with components in production testing at Apple supply-chain partner Foxconn. But before you label a jar “Apple iWatch Reserve Fund” and start pinching your pennies, consider the likelihood that this kind of tech is coming to store shelves soon, if at all.Here’s the thing: Apple builds stuff all the time. Literally all the time they’re working on things, including the fabled Apple television set that has made Gene Munster’