« Guilty Gear Xrd Character Guides, Frame Data by 4Gamer »
Japan's 4Gamer has created its own Guilty Gear Xrd -Sign- wiki, complete with breakdowns of each character in the game. The character pages have basic information, such as move lists and biographies, but also show the ways a character's normals can chain—in GG terms, gatling—and include combo videos with slow motion replays in case viewers could not see the moves used in regular speed.
The biggest thing the 4Gamer site offers to Guilty Gear veterans, however, is the inclusion of frame data for each of the characters in the arcade version of Guilty Gear Xrd.
While the entire wiki is in Japanese, the site offers a starting resource for U.S. Gears players who are already thinking about Dec. 16.