Yes happened alot! Charizard 4x Rock, Swampert to Grass, and Torterra to Ice!!!

Marshtomp. And he's good.

Edit - Damn ninjas.

is there only going to be 3 new starter pokemon or is there going to be an entirely new 150 pokemon?

I would believe there's more, but they could recycle lots of the older pokemon as well.  Like we saw with Pikachu and Psyduck.

i think there evolve stages will have a secondary type. As a basic poke they are pure types.
My guess:
Fennekin evolve stages- pure fire type
chespin evolve stage - grass/fighting
froakie evolve stage- water/poision

I think that Fennekin will be Fire/Psychic.

I also have the distinct suspicion that Froakie will end up resembling one of those frog-based wind gods, like the ones in Zelda: Wind Waker, and thus will be Water/Flying. Part of my reasoning is the cloud-like collar area.

As for Chespin, it's a harder call, because it doesn't really show anything that one would call a distinct elemental trait. I could see it, for instance, being Grass/Normal, because it looks like a regular chipmunk wearing a grass hoodie, rather than looking like a "proper" grass type. The claws on the feet could hint at Steel type, but it's relatively unlikely.

I don't think any of them will be single-type when fully evolved, though.

Plausible guess.  Chespin does look like it could end up being a fighting type.  

Also there are such thing as poisonous frogs, and a water/poison type has been done before.

It would be kind of sucky if Froakie ended up having that 4x weakness to electric.  Haha.

Why? Its only other weakness would be Rock - it would lose its weakness to Grass, most importantly.

The majority of previous generations have had 4x weakness to something on one of the fully-evolved starters. Charizard was 4x weak to Rock, Swampert was 4x weak to grass (ouch), and Torterra was 4x weak to Ice.

By the way, a long while ago now, on the serebii forums, I analysed the possible type triangles that are true triangles. There are four:

Grass/Water/Fire
Fire/Steel/Rock
Grass/Ground/Poison
Fighting/Rock/Flying

In each of these cycles, each successive type is beaten by the one before it, and resists the type after it. So Steel resists Rock and is weak to Fire, while Rock resists Fire and is weak to Steel and Fire resists Steel and is weak to Rock.

Only Grass/Water/Fire has the added property that each type resists itself. Fighting/Rock/Flying happens to have each type neutral to itself, thereby being a different consistent triangle.

If you allow immunities to be equivalent to resistances, then a fifth triangle occurs - Psychic/Fighting/Dark. It's not a true triangle because Dark is immune to Psychic; otherwise, it works like the other ones above.

And just for fun, I thought I'd mention that the longest possible chain of unique types for which each one is supereffective against the one after it is 15 types long (Normal and Dragon cannot be part of the chain, as neither is supereffective against any other type). There are five such cycles.

Anyway, for more fun, there are a few ways that we could have double type triangles, but a particularly interesting one is...

Grass/Fighting, Water/Flying, Fire/Rock

With this cycle (which avoids the dreaded Fire/Fighting pair), each one has a type that would beat one type on either side. The main problem, though, is that Water/Flying is clearly the superior option, with Water being 4x effective against Fire/Rock and Flying being 4x effective against Grass/Fighting.

I was just saying that electric types are already bad to go against with a water type, but would doubly be so if it was water-flying.