I heard that the EOS team has dumped ETH in recent days. Do not know if this is true or not?
The EOS team receive 15-20k ETH a day from the crowdsale...so yes it probably is true that they are dumping ETH. This isn't as bad as it sounds though - remember people must be buying large amounts of ETH in order to contribute to EOS which will have helped to drive the ETH price up beforehand.
Also I think it's natural that contributors to EOS would want block.one to hold a good chunk of the billions of $ contributed already as USD, or at least something that isn't such a competitor to EOS in the way ETH is.
It would be counter-intuative if EOS held all the ETH they received, released an amazing project that took the market by storm and took a massive chunk of Ethereum market share. If this happened, the price of ETH would tank and EOS would be left with a great project and no money lol