The latest episode of Command School deals primarily with RA3, although there's little info we don't already know. Go to EA's website if you want to see it.
Also unrelated, gamereplays.org has reported that Chris Corry (RA3 lead developer) has confirmed the scrapping of the "Red Alert" button concept. This idea would've meant that someone who was losing a game could hit the button, giving them very quick unit buildtimes, but stopping them from building or repairing structures, while in fact damaging structures, ultimately causing the player's base to self-destruct if they did not win in a certain period of time. The idea was the subject of much discussion on the official boards and elsewhere.