Biggest thing id say would be the raid content in the dragon which you know about and then recently the addition of SOLO as a quest options for all of the harbour quests.
Coming soon in July - new spells including Wall of fire and teleport, theres Dimension door too. New monsters and a new zone. Monsters include the Mindflayer. And a patron system were your goign to earn some kind of favour with each house oh and a mail system that sounds not too dissimilar to WoW's - but this is all July content.
If you did retry then id move Gottaa to DBC and play with them. They are a very undemanding group and have characters of all levels. They post on their forums daily what they want to do and people jump in and assist them. Average of 10 - 15 people on most nights.