April 30th was a date included in Dragon Age boxes, saying the DLC can't be redeemed from that point on. It's all a load of misinformation.
"EA BioWare has confirmed there is no expiry date on DLC codes," publisher EA told . The April 30th date was on a bonus DLC leaflet, which is part of EA's Project Ten Dollar that encourages first-hand sales by promising free content.
Dragon Age: Origins and Mass Effect 2 both included bonus DLC with free new quests, companions and in-game armour and weaponry. Cool, eh?