The origin of this phrase is in an under-appreciated lolcat, where an evil-looking cat is watching a chihuahua, with the only caption being SOON.
When pronounced, it helps to add suspense and drama by saying "SOON." in a low voice employed by that movie advertising dude.
Otherwise there is another soon. the Blizzard "soon" which can be a very LONG time 6-24 months actually.
Yeah right, more like in 2005