Xmoo, besides leaking HTC Mozart pictures, also posted this spec sheet for the HTC Spark. Interestingly it mentions only 512 MB of storage, suggesting this may be one of the devices HTC will have to preload with a memory card.
The hardware buttons apparently also include a Send and End key, which does raise some suspicion regarding the veracity of the sheet.
The mystery deepensâ€¦
See the original twitpic here.