You can get it here: https://github.com/btcdrak/bitcoin/releases/tag/v0.12.0-addrindex
It seems the same as 0.12rc1, but there are Gitian-generated binaries signed by btcdrak.
In terms of bitcoin.conf settings, maxmempool is new (300MB is the default, 30MB should be enough for most), while relay and the minimum fee settings that used to be necessary in 0.11.2 are not needed in 0.12.