Yes, From what I've read, the Onyx was just an updated Bold, just with 3.2MP camera and optical trackpad, but from what I heard, it was also going to be the same model which they would finally introduce a 3G berry for Tmo's AWS 1700 Spectrum.
The MAGNUM is what I though to be the Berry that like the Onyx and Bold, will have the same specs, only difference is sans the trackball/trackpad and have a touchscreen on it.
The 8520 is no hybrid, but it's roots are like a curve only it's made to be low end budget en-mass production curves for folks who want an affordable berry. It has a lower end processor, uses the same batteries as a old curve does , trackpad, and camera with no flash.
ODEN aka Storm 2 should be also available to GSM carriers, whether ATT will carry it, only time will tell. But both versions will come out for cdma and gsm carriers.
Mobile/PDA Support Engineer