The rumor flying around last May about a 10.1-inch HTC tablet said to be called the HTC Puccini turns out to have some truth in it after all. The HTC Puccini was spotted just recently passing through the Federal Communications Commission (FCC) carrying model number PG09410, and by the looks of its internals, it seems en route to AT&T, too.

The FCC filing shows that the HTC Puccini carries the required GSM and WCDMA radios–but the yummiest of the bunch is the presence of LTE radios. The diagram that HTC submitted to FCC also shows what looks like a slot for a SIM card as well hints for dual-speaker capability.

Earlier rumors claimed the release date for the HTC Puccini to be in June–but since June is long gone, new speculation points to a release date some time before summer ends. We’re betting on an August 10 release, but that’s just our gut feeling.

The tablet will surely carry Android 3.x Honeycomb, but as to what specific version of Honeycomb, no one knows for certain. It’s likely to be 3.2, with this version’s better support for Qualcomm processors, such as the dual-dore 1.5-GHz Qualcomm Snapdragon MSM8660 that the HTC Puccini will run on. The Puccini is also said to come with a display resolution of 1280×800. The FCC diagram, however, seem to not hint at a 3D camera, so there’s unlikely to be one on the Puccini. Support for HTC’s Magic Pen stylus has also been mentioned.

Judging by its specs, the HTC Puccini seems to be the HTC Flyer’s bigger brother. Will you be letting bigger brother take care of your tablet needs?