This is something new in Tonga: Coca Cola tailored for Tonga, launched perhaps a month or so ago.
The can says "The Coke side of Tonga" as well as "Ifo Atu". As far as I can gather, the term "Ifo Atu" is not actually used in Tongan, but it's a mishmash of terms that's intended to mean something on the order of "incredibly delicious".
So does it live up to it's name? I don't drink regular Coke (diet Coke only), so I have no basis for comparison, but apparently it's tailored for the Tongan palate, which means it's even sweeter than normal. Just what the doctor ordered...more sugar.