yes they are in "Ancient Prophecy" & Stadust Overdive" packs
the following link shows how to unlock all pack's-
http://www.gamefaqs.com/boards/genmessage.php?board=978594&topic=53671965
Buy packs
44508094
Darkness Neosphere can be obtained in the "World Championship Edition 9" booster pack.
do battles/ time attack in old city at the computer in any duel runner shops
Yusei and Crow
Armed Dragon LV7 appears as a Super Rare card in the "Soul of the Duelist" booster pack in "Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia".
it allready did
Around the end of February.
A different Egyptian God Card is made available for download from Wi-Fi Connection at the end of each month.
Revival of the Fableds, Justice Strikes Back, Genex's onslaught, Ruler of Chaos, Whirlwind of Dragunity and Pulse of Trishula.
it doesnt matter so just go on
Not within the game.