Robotech X has a video interview with George from Toynami at Comic Con on their website. In that interview, George said that they had to add weight to the feet of the Beta to counteract the weight of the Alpha. That way the whole thing didn't fall over.
So, if you didn't like the weight of the Alpha, you are in for a ride with the weight of the Beta.
Personally, the weight doesn't bother me, I prefer a toy to have some weight to it, not like the feather weight of the CM combo.
As to the link up between the two products, that would be interesting to see. When Jenius does his review, hopefully he can take a look at that.