It's my understanding that the second token sale will be done once the token is much higher in value (around $20 i believe was mentioned) and it is done in order to increase the liquidity of the token while providing additional capital for the Mybit foundation to be able to expand. As you can see in the end of year summary, it has been confirmed that there will be a burning model implemented for network access. This will be pegged at $1USD worth of mybit and will decrease supply over time (which is hardcapped at 5million), I am a long-term hodler of Mybit and I consider the token sale phase 2 necessary for Mybit to reach its full potential