Alright, imagine Monero is like a super-secret digital wallet, much better at keeping your stuff private than something like Bitcoin. It's great at making sure no one can see what you're doing when you're sending or receiving money, but it's always trying to get better. That's where this new upgrade
Is there a timeline for possible implementation of this? Or is this still in the research phase? Or what? Because this is the first time I'm hearing of this upgrade.
good point. FCMP++ will be an upgrade to the Monero protocol through a network upgrade. to realize the privacy benefits of it, you need a new addressing scheme. so far the scheme was planned to be Jamtis-RCT. Carrot is a separate addressing scheme to be used with FCMP++. nothing prevents the simultaneous use of both, and they look the same to outside observers. FCMP++ was basically "upgraded" by adding another potential addressing scheme to it.
this doesn't guarantee that both will be used. my guess would be that the industry will converge on one addressing scheme.