I have updated a few things here and there on the First Quest of Zelda 1.5 Deluxe, and the Second Quest is already in detailed workout. You will notice a few different level entrance locations in the Second Quest, as well as a few enemy changes in the overworld, and a few geographical tweaks at some places. One example is when you had to use the Super Bomb to open Level 4 in the First Quest, you will have to blow the Whistle now at a certain spot to reveal a hidden entrance, and it's not leading to Level 4 anymore.
More information to come of course. I am not sure if you can still play it with version 1121, so I altered the minimal version to 1346 (which was the last build I used to edit the overworlds of the First and Second Quest). I won't be uploading the quests to the database anymore though, as there will be lots of updates, and it usually takes a few days for the admins to update the database with new quest versions from players, and I tend to update my quests daily. :p