That's pretty sad...It's not just the lack of jointing, but the clothing looks pretty cheap too. One of the things I like about MH is the intricate clothing details. Plus, of course, jointing.
But, the pictures from the official reboot do show jointed arms, as well as different faces than what these other new ones. (not on my phone, so I can post a picture!)
So, maybe these other ones are a cheap line, kind of like the $5 Barbies?
I guess since MH is technically marketed towards 7-10 year olds, the jointed arms on the normal ones might be more prone to breakage if you are playing with them like a normal younger kid would. I'm thinking they aren't going to completely do away with jointing, but probably are just adding some in for the younger end of the spectrum who might be more likely to have dolls with broken arms, or lost hands.