It was the misleading title that I really was pointing out.
"Mortal Kombat Demo Koming Soon to PSN and XBLA
Get a taste of the newest in fatality technology.
March 3, 2011"
They should have said it was coming soon to the PSN and at a much later date for XBLA from the outset instead of being cryptic about it. Saying we would get it later doesn't give any timeframe, be it a week, or a month or release day.
I'll be playing MK vs DCU and UMK3 till I get the game, and if a demo arises on release day on XBLA and my copy hasn't arrived in the mail yet, I'll grab it to sate my curiousity on the game. If not, I'll just be waiting.