Here is some more info directly from binance regarding the presale coming tonight: We will launch ICO warm- up session of TRON on Binance exchange at 12pm. Aug 22, 2017 (Beijing Time).

ICO of TRON has four sessions as follows:

Warm up session
BNB session
BTC session
ETH session
The details for warm-up session:

Token name: TRX;
Amount of warm-up session: 500,000,000 TRX
Support market: BTC;
Exchange rate: 1 TRX = 0.00000038 BTC；
Start Time: 12PM. 2017/08/22 - 12PM. 2017/08/29 （Beijing Time）
Sale type: first come first served basis
Warm-up session link:https://www.binance.com/icoDetails.html?projectId=6 (recommend PC participation to get better experience)
I hope this is clear now :)