For reference, here are cards from the 2008-09, 2009-10 and 2010-11 Hockey Heroes sets.
We are now going to see a set that will focus on players from the past, an homage to “the old-school”. In the 2011-12 Series One release we will see a 12-player checklist from the 1950s, 2011-12 Series Two will include 12 players from the 1960s, 2012-13 Series One will bring us 12 players from the 1970s and 2012-13 Series Two will bring us 12 players from the 1980s.
Additionally, with the 2011-12 Series One in Hockey Heroes insert 10 of the 12 cards on the checklist will include an on-card autographed parallel of the base insert card #/15. Does a hockey collector need more? A 13th card has been added to the checklist, a painted art card (not sure if this is really painted or printed) of Howe, Bathgate and Hull has been included in to packs and will also include an on-card triple autograph parallel version #/10.
The cards will also be numbered sequentially from set to set to allow collectors to build a complete set. The 1950s set will be numbered HH1-HH12, the 1960s set from Series Two will be numbered HH13-HH25 and so on for the 1970s and 1980s sets. Apparently the painted card is not considered part of the base insert set.