Yes, temperature monitoring was merged with Changes to Environmental Measurement App by crossan007 · Pull Request #705 · meshtastic/Meshtastic-device · GitHub
The config settings for it are defined here: udpate protobufs for environmental measurement preferences by crossan007 · Pull Request #14 · meshtastic/Meshtastic-protobufs · GitHub
Right now it only supports the DHT11 sensor, connected to pin 13 Changes to Environmental Measurement App by crossan007 · Pull Request #705 · meshtastic/Meshtastic-device · GitHub