Quote from readme:
Before running the GUI, it's recommended you have a copy of bitmonero running in the background.
./bitmonerod --rpc-bind-port 38081
Run the GUI client.
./release/bin/monero-core
Official New GUI connects to ./bitmonerod daemon and communicate with daemon with RPC calls? I think Yes. This I mean by "another RPC thing" because it connects using RPC. You should run ./bitmonerod or am i wrong?