I don't know if anyone has mentioned this yet, but sites like Amazon UK have placeholder box art up - and the logo used in that has blue/red flame at the end of 'Bros'.
Why could that be significant? Because Smash U had blue flame and Smash 3DS had red flame - and the combined red/blue flame on the placeholder art is the same shape as the flame logos used for Smash 4 on Wii U/3DS. Is this a sign that we're getting a Deluxe version, combining 3DS, Wii U and dlc?
EDIT: This looks like it is probably completely insignificant - other sites are using the new logo as their placeholder. Ignore my ramblings.







