OK, I just got an answer vis-a-vis the Eminence 12" woofer in the V3 Rumble 112 vs the 12" Eminence woofer in the Rumble 100 1x12 combo. The newly designed Rumble 112 woofer has a 2" voice coil vs 1 1/2" in the Rumble 100. The ceramic ferrite magnet is also larger/heavier, but I have not been informed of the actual weights of each. I feel fortunate to be able to get the information that I do get, so I don't push it. It seems logical that the magnet would be in the neighborhood of twice as large/heavy.
In a direct A/B comparison between the new V3 112 and the V2 112 Neo, I have been told that the Fender design team found that they preferred the new V3 ceramic over the V2 Neo. "It played louder and had a fuller low end response with smoother mids and highs." It's not as light, but it does have a smaller footprint and is $100 less expensive.
So there you go fellow Rumblers, straight from Fender to you with a bit of paraphrase from me.
Rumble On!