This person has been posting translations of the Famitsu scans featuring those new screenshots (about Robin, Lucina, Capt Falcon, WFT, Little Mac and Rosalina).
http://kantopia.wordpress.com/category/translation/video-games/super-smash-brothers/
Interestingly enough, the Famitsu scans appear to have info about a couple custom moves for WFT, Little Mac and Rosalina each. There's information about the other characters as well, but it doesn't seem to be anything too interesting.
WFT Neutral B:
Sun Salutation - this move supposedly heals WFT in its normal form
"Pushing Sun Worship" - this variant is slower and pushes opponents back while hitting them multiple times
"Concentrate Sun Worship" - this variant charges faster but doesn't heal
Additionally - WFT's up-B can travel further if you mash the button
Little Mac Neutral B:
"Numbing Straight" - when fully powered it stuns opponents, but Mac loses the super armor while charging
"Engulfing Fire Straight" - adds flame effect, charges faster, but deals less damage
Rosalina Down B: (standard: Gravitational Pull)
"Catch & Release" - she pulls in opponents and tosses them away, but no longer attracts items
"Guardian Luma" - Luma gets larger and protects Rosalina
Maybe there's something wrong with these translations, if so sorry. The layout of the Famitsu scans and the screens certainly suggest that they're custom moves, though.