This is apparently the HTC Puccini, the rumored 10-inch tablet HTC is preparing to follow its seven-inch Flyer/View 4G. Most notably, it looks like a Puccini variant will be one of the first devices compatible with AT&T’s “true 4G” LTE network, deploying this year. Specific details about this model remain elusive, although it’s likely to run Android 3.x Honeycomb and support HTC’s Scribe capacitive pen input technology. Since Giacomo Puccini was a 19th and 20th century opera composer (La Boheme, Madame Butterfly), there may be a musical focus here as well.
A March leak had this tablet shipping sometime in June, price unknown.