Lightroom, as Alex said:
Adobe Looking to Bring Lightroom-style RAW Editing to a Tablet Near You
http://petapixel.com/2013/05/02/adobe-looking-to-bring-lightroom-style-raw-editing-to-a-tablet-near-you/
The card readers are excellent, I’ve got one, and I nearly always take it out with me, along with the pad, when I have the camera with me intending to take photos.
There is an alternative, but it’s more expensive, and that’s a wifi-enabled SD card. With one of those, you can send photos directly to the pad, and I’ve read about a pro photographer who uses one for studio portraits, because he can be taking photos, and the rest of the family can sit with the pad and look at the photos as they’re taken.
I’ve seen a wifi-enabled SD card adaptor as well, which would allow up to 32Gb Micro SD cards to be swapped out when full, the regular type are only 8Gb, IIRC, but I haven’t seen the adaptor cards on the market yet. I’ll snap one up when they do.