We've caught a few fleeting glances of the upcoming HTC Fireball in Verizon Wireless' internal computer systems, but there's still no official word on the phone from either manufacturer or carrier. It's definitely out there, though: Ameblo spotted a filing for the new phone in the Wi-Fi.org certification database. That doesn't mean much beyond the fact that it comes with WiFi (go figure) and that HTC and Verizon have already settled on plans to sell it. The only other thing we can say for sure is that it's a 4G LTE phone.
Previous listing paired the HTC Fireball with the LG Spectrum (AKA Optimus LTE) for a December launch. Obviously that didn't happen, and the Spectrum got a release all by itself. There was at least some evidence that both phones would get international data, and considering that global capabilities have been discovered in the HTC Rezound and officially unlocked in the DROID XYBOARDs, that's still a possibility. However, at present the Spectrum hasn't shown any indication, and the Fireball may have been a false alarm.
So what does the Fireball look like? Considering that the "ADR6410L" model number falls squarely in between the Thunderbolt and Rezound, I'd say it's an updated LTE version of the DROID Incredible 2. That might be this shiny white phone spotted last week, running Ice Cream Sandwich in a spy video. Nothing's set in stone, of course, and the two devices might be entirely unrelated, but at the moment it's the best we've got to go on. Theories welcome in the comment section.