The mysterious new character to Guilty Gear xrd has been revealed to be Bed man basically a kid screwed into a bed that has mechanized attachments. The only thing that has been revealed is the image and the voice actor Hikaru Midorikawa who has experience in both anime and video games. You can check out the image below as it reminds of zappa or Aba.
Bedman move list
Also here is an image showing Zato 1 and Bedman from a magazine showing the two off in two pages.
One last up date it seems that in the next location test the character will be able to use Ik or instant kills. Also the voices that will be used in xrd are going to be present which is what we had in the beginning. Here is the article giving us the information. It is from famitsu magazine and is in Japanese.
Famitsu Article:http://www.famitsu.com/news/201311/28043916.html
Article:http://gematsu.com/2013/11/guilty-gear-xrd-signs-mystery-character-is-bedman
As always thank you for reading.