Considering there are only there shell patterns in this wave, I think it's very likely another wave will eventually appear.
Although this is a really late reply; I agree with Burnt Snow about which is better.
I prefer the +C over the Tama-Go, but my opinion isn't set in stone yet considering I haven't purchased a Tama-Go, yet.
To me, the +C offers more technically. The Tama-Go may seem better because of the expanded play, but you have to pay $7 a pop to "expand" it.
The +C comes as is, and as BurntSnow said: has happy items, lots of locations and items. It's like a Tamagotchi plus Tamatown on just that once device.
Anyway, question time~
- Do you personally think that the Tama-Go will introduce a wave of different designs later?
- Are you able to go outside with the Tama-Go like in the +C? Is there changing weather if so?
From other Tama-Go logs I've read, it appears that with certain Character Figures, you can essentially go outside. (I have only one Character Figure, and it doesn't support this feature.)