There's no way this wasn't intentional
It's a widely known secret of the tech industry that most product leaks simply aren't. There's a benefit to letting certain details leak out to the press ahead of time. You can raise excitement for a new product and gauge consumer response without committing to anything. Ahead of a big show like CES 2011, strategic leaks are the only way to ensure your product gets a fair shake.
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Take the HTC Thunderbolt. We've been hearing rumors of a follow-up to the Incredible named the Incredible HD. There'd been speculation that this new smartphone would be LTE-capable, but no hard evidence. Until this week, when the sign-up page for HTC's mysterious new 4G device went live. We didn't have a lot of time to wonder.
Almost immediately after, a dozen shots of the Thunderbolt leaked out to Droid Life. All the images were airbrushed and looked like they came right out of a press release. Either HTC's marketing department has zero security, or this "leak" wasn't accidental at all.
From what we can see, the Thunderbolt looks a lot like a Desire HD. It's unlikely to have one of those fancy new dual-core processors everyone is so excited about. This will probably prove to be a wise decision. LTE is going to drain that battery enough as it is, thanks.