I would've bet the house on it yesterday and if I did, I might have been homeless today. Because according to a Dell source speaking to Forbes, the 10-inch tablet is currently "unbranded," debatably due in part to the Streak name not "[holding] enough cachet to warrant an addition."
The possibility of the device not being a part of the Streak family is of no consequence to most people, but for a site dedicated to all things Dell Streak, it's a crucial detail. If the Streak 10 ends up being called the Smudge or the Smear, then StreakSmart will live and die with the Streak and Streak 7.
The Streak brand is weak compared to, say, the Motorola Droid or HTC EVO brand, but it's not dead. It may not "warrant an addition," sure, but I think it could benefit from one.
[Forbes via Engadget]