JacktheRabbit
Explorer
There will be a selection of DDAL adventures covering all tiers (1-4, 5-10, 11-16, 17-20). Indeed one of AL's guiding principles is to create more high level adventures in support of the current seasons. So yes, you need a new character to play the new low level adventures. You will also have your current higher level PC for the new high level stuff! Its a win, win.
There is or there will be? 5E came out 4 years ago.