The few XEL trades on the HEAT AE (145 XEL in total) were just used to test the automatic deposit and redemption functions. If you already have an account on HEAT, it is already now possible to trade the BTC/XEL pair, but the order books are currently quite limited. What opens up tomorrow is the description on how to use the automatic deposit / withdrawal functions. Hopefully many XEL holders will participate so that we can get some volume on the sales side of the order book.
not too much people want to sell, i think.