Actually, it kind of does.
These fairs are for retail-buyers to pick products for their stores to sell during that year/season/whatever-period-the-fair-covers. If an item is at one of these events, then it's being pitched to retailers for release during one of that year's big shopping seasons.
If stuff from these events doesn't appear at retailers, it means that most or all of them passed on it, so it won't see release at all. Sometimes some ignored items get another shot the following year, but very often they don't and end up being entirely cancelled.
Yeah, this is the sort of information that investors are privy to, rather than the general public and fan-sites. That said, some companies do publish their Investor Relations documents publically somewhere on their corporate websites, so maybe that's something to look into?
As an aside, what retailers pick up from the trade-shows can also give us a little bit of insight into what they feel sells well enough to warrant carrying a line, so we can at least extrapolate some small clues from that.