Conversation so far:
what happened with the blink-182 in 2015?
Hoppus and Barker decided to continue on without DeLonge, and enlisted Alkaline Trio vocalist/guitarist Matt Skiba to "fill in" for three shows in March 2015.
what happened to DeLonge?
After legal battles with DeLonge were worked out, Skiba joined Blink-182 as an official member and began preparations for new music.
what were the legal battles?
CANNOTANSWER.

Question: did they produce music with the new line up?
Self-contained rewrite: did Blink-182 produce music with the new line up?