It's just another fork.
But it does not have relay protection at this point, and probably will not when it happens in August.
There is no more danger then with any other fork.
No real privacy concerns, you just have to be careful when or if you move the coins.
But, in the end it's no different then BCH, BTG, BTK, BCD and all the other forks from 2017. Just 9 years later.
How Many Bitcoin Forks Are There? You will be surprised!!!With many previous available forks from Bitcoin, they're altcoins and most of forked coins failed and died already. There are very limited forked coins have still survived so far but if looking at their promise at their project beginnings, it's hard to consider them as successful projects.
When I read eCash, I recall that it is not a new Bitcoin fork, and check information with Wikipedia, it's a fork in 2020.
https://en.wikipedia.org/wiki/List_of_bitcoin_forkseCash: Forked at block 661648, 15 November 2020, for each Bitcoin Cash (BCH), an owner got 1,000,000 eCash (XEC).