Howling:Regeneration cube?

I remember back in March, that there was word of a "Gallifreyan Regeneration Cube" set that was going to be released around Christmas time. Speculation was at the time that the Cube was a means of resurrecting a Time Lord, and this would presumably be how the Doctor avoided the 13-regeneration limit in the season finale. Well, the season finale was come and gone, and the Regeneration Cube hasn't been heard of for a while. No word if the Cube will feature in the Christmas special. Does anyone have any idea of what this "Cube" really was? -- Bold  Clone  22:44, November 21, 2011 (UTC)