The new loops and pins should be in Scout Shops. If yours does not have them yet, they should be on their way soon, or you can order them from ScoutStuff.
The new Academic and Sports program guide (with the new requirements) should be in your local Scout Shop by the beginning of January.
But - STOP THE PRESSES - BSA has finally done something smart for the Cub side of their National Site. They have listed all loops AND their requirements. This is similar to what they have done for Boy Scout merit badges for a few years now.
So, no need to wait until January for the official requirements for the new loops/pins. You can find them here, now -
BSA - The Cub Scout Academics and Sports Program