"Stay tuned for news on demo plans in a few months."
Sure, this isn't an official announcement, but the mere fact there will be news, is news, in my opinion anyway. It's also interesting that the demo may be coming in a few months when ME3's release date is more than a "few" months away.
If you take into consideration the rumors of Mass Effect 3 having co-op or multiplayer, then it's feasible to believe the demo would be more of a beta. Betas are so hot right now.
What do you think BioWare has in store for Mass Effect 3?