Double the fun in this post because I didn't particularly bother before.
Peach is in. She was in the "Sure Bets" category. I don't think there's much to say here, except I hope her final smash is a giant radish.
Diddy Kong looks like he'll actually be an interesting addition. I don't expect to see anyone else from the Donkey Kong zone, and I still only expect a total of two from the "Maybe" category. This means that Toad, Black Shadow, Wolf Link/Midna, Dark Samus, some character from Mother 3 and Star Wolf are all going to have to duke it out to see who is in the game. However, I'm officially downgrading Toad to "Iffy". Peach clearly can still use him as a shield; fighting him at the same time would be awkward.
The pace for character announcements has been about what I expected on average. There was a dry spell for a while, but we've been recently hit by a slightly greater number of characters. I'm personally still waiting for Luigi, I'll never get enough of the Green Missile.