I wrote a post a few months ago when the initial checklists for 2010 Topps were released. I recently checked into the set again, and found that a few more details had been released. Along with the odds of actually pulling the cards, here's what else I was able to find out. Unofortunately, there haven't been any pictures of the Rickey cards released, so this will be a fairly text heavy post.
--There will be a parallel to the "Cards Your Mother Threw Out" set, called an "original back parallel" which I'm assuming means the back of the card (instead of describing the card that was "thrown out") will look just like the back of the original version of the card featured on the front. This is a 58 card set, with one card representing every year of Topps, and I can only assume that Rickey's 1980 rookie card will be used. These parallels are inserted at approximately one per box.
-- Missing from the first checklist I saw was a Past & Present insert featuring Rickey and Carl Crawford. There will be a Past & Present Relic parallel as well, but unfortunately, only 15 cards from the 30 card set will be included, and Rickey's is not one of them.
-- There will also be Hall of Fame Buybacks randomly inserted, but the checklist has not been determined. The info sheet lists that it will contain 500 "subjects," but since there are less than 300 Baseball Hall of Famers, some players must be represented more than once, and being the newest Hall of Famer, Rickey will probably be included.
-- The Peak Performance relics commemorate the "career landmarks" of over 80 players. Rickey's all-time stolen base record will probably be chosen, but they could surprise everyone, and commemorate him setting the all-time walks or runs records as well. Rickey is included in the 82 card Peak Performance relic set, but is not included in the 50 card Peak Performance base insert set.
-- The "Hat Logo" cards will be manufactured, complete hat logo patches, each number to 99 copies. Rickey actually has four cards in the set, but it's not yet known which four teams they have chosen for him to represent. If I had to guess, I'd say the A's, Yankees, Padres, and Blue Jays.
Here's the updated checklist of all that I know to date:
The Cards Your Mother Threw Out
MTO29 Rickey Henderson (1:3 packs; 1 per jumbo pack)
MTO29 Rickey Henderson "Original Back Parallel" (1 per box/jumbo box)
Past & Present
PP30 Rickey Henderson / Carl Crawford (1:4 packs; 1 per jumbo pack)
Peak Performance Relic
PPR-RHE Rickey Henderson (1 auto/relic per box; 1 auto and 2 relics per jumbo box)
Hat Logo Relic (1 auto/relic per box; 1 relic per jumbo box)
MHR-110 Rickey Henderson (#/99)
MHR-111 Rickey Henderson (#/99)
MHR-112 Rickey Henderson (#/99)
MHR-113 Rickey Henderson (#/99)