Check here: http://nbafile.com/nba-2k12-demo-for-x-box-360/
It looks like there might be a signature gather package now. Dirk has several different kinds of signature gathers.
The NBA 2K12 demo is available now for the 360. Later today for the PS3.
Big thanks to German friend DaWolf! #1 http://www.youtube.com/watch?v=R9N0dk1LzRo
Online Video: Check out the very first look at NBA 2K12 from E3, as Kobe Bryant plays with the PlayStation Move Support. (Via)
Source: http://news.teamxbox.com/xbox/23033/NBA-2K11-Demo/ http://marketplace.xbox.com/en-US/games/media/66acd000-77fe-1000-9115-d8025454087a/?p=1&of=0&bt=0&sb=2 http://www.pastapadre.com/2010/09/14/nba-2k11-demo-now-available
Great news for X-Box 360 players You can download NBA 2K10 Demo now: Click here at X-Box.com