Since spotting my first kode a few days ago, I am now seeing them all the time, I would guess at a rate of about 1 in 10 games. Keep your eyes on the Wonkavision as the bonus counts, and unless you're rocking a big bonus, don't even try and take a photo, you won't have time and you'll forget the kode! Familiarise yourself with the icons before you play, some of them are very similar and in the heat of the moment they are easily forgotten; I have seen 5 now, never quick enough for a photo, and I can only remember one, the easiest code ever.
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They are not all this easy, some of them have different candies in all six slots.
If I find anymore I will post them here, but I think we should refrain from saying what they do so as not to spoil the surprise for others