There supposedly is some new letter plan that will replace them. For at least a little while, Part F will continue for those of us who already have it, just not be available for new people. Our broker mentioned the new "magic" letter, but, for the life of me, I can't remember what it is. We've used the same broker for well over 20 years, and he's always given us good current advice, so I'll leave it up to him. I do know that at least my Part F plan will continue, since I received a letter with a very large monthly increase (from just over $200 to $290).