The latest one says the following, and remember, this is before the announcement of Elite's cancellation/delay.
Looking for NBA Jam complete with a career mode and without NBA Elite attached? The Ball reveals a big hoops-related Xbox Live Arcade announcement around February's NBA All-Star Weekend.
Again, doesnt matter now since we are certainly getting it before the holidays.....it just remains to be seen if EA continues with a Arcade release or goes retail like the Wii.
Also...if this were true, what would the people with Elite 11 do if a "full" version of Jam ended up on XBLA.