"As another offering for fans, those who register both Wii U and Nintendo 3DS versions of the games in Club Nintendo – before a set time - can claim the Super Smash Bros. for Nintendo 3DS & Wii U: Premium Sound Selection, a free soundtrack CD packed with tunes taken from and inspired by the games. Further details on the timings pertaining to this offering will follow at a later date."
This offer is available to members in Europe and North America, but unfortunately is not currently available elsewhere.
Has this convinced you to buy both versions, or were you getting both anyway and this is just a nice surprise? Let us know!