Vaporware is software that hasn't been written yet. Or it is software that is supposed to have certain abilities and doesn't deliver them. Most commonly, it is software that is released later than the announced date and/or is missing functions that were promised. Vaporware is a bad word in the geek world.
I live on the east coast of the US so when it is early in the morning for me, it's still the middle of the night for a person living on the west coast. A kit that is to be released on Wednesday and actually is released on Wednesday morning on the west coast, shows up at lunchtime for me. If it's something I'm looking forward to, I'm a bit annoyed. Wednesday is half gone. I wanted that kit first thing in the morning! If I was awake at midnight, I probably checked the site, hoping it would be there.
In many web store applications, it is possible to upload an item for sale and set a date and time for when it will become available to the public. At the correct time, poof! the item is available for sale and the seller could be sound asleep. Or still having that first cup of coffee. Or halfway around the world in a completely different time zone entirely.