Hey guys, I'm new here. Made the account specifically for this thread in fact. I've got some speculation and I've been dying to have some others besides close friends hear me out xD
First of all, Froakie clearly looks exactly like Benjamin Franklin to me. This cannot be an accident, he even has the little glasses. In relation to that, I believe Froakie will become a Water/Electric type, with his "bubble" hair turning into clouds in a Raikou/Thunderous type fashion. Water/Flying and perhaps Water/Fighting are also options. However, I don't think gamefreak would create TWO Water/Fighting Frog pokemon and if you read further, Water/Flying would force Fennekin into the Fire/Fighting spot (Fire Psychic would not work because the type combinations for Chespin do not allow it without Froakie being Fighting). This could very well be the case, I'll get to this in a second.
Chespin can be many things at face value, perhaps Grass/Fighting, Grass/Ground, Grass/Steel, Grass/Rock and Grass/Dark. I'll explain why he can't be Grass/Fighting in a moment, and my thoughts on Grass/Ground. Grass/Steel wouldn't work either, as a Fennekin would then have 4x super effectiveness against him. None of the options I've thought of allow Chespin to be 4x super effective against Froakie and for Froakie to have the same typing against Fennekin. Fennekin would need to be Fire/Ground or Fire/Rock, and of those only Ground could possibly make sense. If he is ground and Chespin Steel, then Froakie would need to be Rock, which seems very far fetched. This means that the only possible typing I see left for him is Grass/Ground, and Grass/Rock unless these pokemon go through some seriously drastic changes in their evolutions.
Next we have Fennekin whom I think will be either Fire/Flying, Fire/Fighting or Fire/Psychic. Fire/Flying would give him a distinct advantage against Chespin though, especially if he turns out to be Fighting, the same can be said about Psychic, and if he was Fighting then Chespin would not be. So if my speculation on Fennekin is correct, Chespin CANNOT be Fighting as secondary. In the case of a Psychic Fennekin, a Dark Chespin would not work either, it would allow Chespin to be super effective against Fennekin, but then Froakie would have no such advantage versus Chespin, and it would be unequal. A case where this could work is if Froakie ends up being Water/Fighting, Chespin as Grass/Dark and Fennekin as Fire/Psychic, then all of them would be both weak to, and strong against their counter parts. However, again, I don't think a Water/Fighting Froakie would be accepted since he would be a carbon copy of Poliwrath.
In short, my hypothetical combinations are as follows:
(Fennekin as Fire/Flying, Chespin as Grass/Ground, and Froakie as Water/Electric) This makes it so the Power Triangle actually has two lines, Fire beats grass, beats water, beats fire, and also Flying beats ground (Not super effective, but immune), beats Electric, beats Flying.
(Fennekin as Fire/Psychic, Chespin as Grass/Dark, and Froakie as Water/Fighting) I don't think it will happen, but it's the only way I see to make Fennekin Psychic, and it technically would work.
(Fennekin as Fire/Fighting, Chespin as Grass/Rock, and Froakie as Water/Flying) Same as option one except with different typing.
So really only options one and three are in the race, I can't see them making Froakie Fighting. Due to angst from the community, I doubt they are going to make a fourth Fire/Fighting type, and the wing-like fur on Fennekin does inspire some Flying ideas. He is also based after a Desert fox, no? And we all know about the desert and it's ties to wind and heat.
In conclusion, I think that the typing will be option one, [Fennekin as Fire/Flying (Desert Fox), Chespin as Grass/Ground (Hedgehog), and Froakie as Water/Electric (Benjamin Franklin)]
Sadly, I don't think I'm allowed to post my favorite fan art.
Do you like this? Any problems with my post and theory? Please feel free to respond ^^ and thanks for reading.