The new simulation mode works in the same way as the current debug mode, except that true hardware is not exercised — instead, the Intel SGX instructions are simulated in software.
This means that running the Enigma testnet in simulation mode will not require you to have Intel SGX hardware enabled on your machine. Instead, you will use the Simulation Libraries to run application enclaves in simulation mode and try out secret contract development. However, this mode will not provide hardware protection.
Let us know if you run simulation mode and have feedback-- help us improve the dev experience!