Today BitcoinABC released a new version of their software with implementation of CashAddr format. What is it and how does it work?
First of all, no it's not a fork, neither soft, nor hard, and not a new protocol. And no, there will be no change in users' public or private keys. So, with that out of the way, let's look at what did change.
If you have ever seen Bitcoin or Bitcoin Cash address, you now hw it looks like – just a sequence of numbers and letters. The new address format is just a different encoding variety, to lessen the confusion between BTC an BCH. The new Bitcoin Cash address will look like that
Notice the bitcoincash prefix. That's the whole point. While it's always there, but previously may have been omitted or missing entirely, now it's an integral part of the address. While you can still use the old address format in your transactions, the developers strongly encourage users to utilize the new format, even providing the links tools for converting “legacy” to a new CashAddr style addresses, like https://cashaddr.bitcoincash.org/
Please remember to use only trusted tools, so there will be less chance to get a scam address instead of the target one.
And upgrade your wallet, most of the services will implement the changes quite fast, but it can be prudent to alert the devs about a new format, so the transition will be smoother and faster.