User blog comment:Hoshi no Kabi Star/Smile Pretty Cure: Possible Smile Pact Hint/@comment-4330746-20120209001529/@comment-4330746-20120209041012

Suite had alot of colors in terms of Fairy Tones (there were 8 of them), but from episode 6 onwards, when Melody gained her Belltier, it was clear that there were only going to be 4 Cures, each of them having 2 Fairy Tones. Besides, the Cure Module only had 4 crystals on it.

Also, if you look at the official logos of Fresh and Heartcatch, the exclamation marks has 4 colors, indicating 4 Cures each season, even though there were only 3(FPC) and 2(HPC) at the start of the season. That's why I said that looking at Smile's logo, 5 Cures seems to be the final number. Not saying that I'm 100% correct, it's just my theory. ;)