From the Announcement section at login:
"Notice for an upcoming change to the Daily Roulette Bonus:
The Daily Roulette spin will affect a new set of card packs set aside specifically for the Roulette.
Look forward to seeing the new packs after the October 21st maintenance.
*After the maintenance, Premium Packs, Boxes, and Megaboxes will no longer be affected by the Roulette."
Guess these are the Hyper Packs that seem to have been a mystery since the Roulette was rolled out. Also confirms that Premium/4+ packs have been affected by the Roulette so far.