The first precon to be revealed is the UBR Maestros precon. Joining Anhelo, the Painter on-stage is his new daughter-in-law and the first legendary Phoenix in the game (and yes, it's worded to work way better in Phoenix tribal). Decklist is here (finally).
Just to get this out of the way. To my understanding, you can NOT use Flawless Forgery to copy the same spell twice using Casualty. The copy of FF goes on the stack above the original FF, resolves first, allows you to copy a spell, but that spell is removed. By the time the original FF resolves, it will be exiled and cannot be targeted anymore.
Sinister Concierge, while mechanically clearly different, looks like a horror trope to me and more in line with Innistrad. But that's what we have Commander Decks for.
theres some fun new cards, but don't kid yourselves, this is not worth the price. its the now tired and lackluster mediocre reprints we've come to expect, but for more money.
your value reprints weren't, and will be even less so in a few weeks, and even the new stuff won't be worth all that much this time next month.
as for the new cards themselves i really like determined iteration, but who doesn't, its powerful and we all know it. i also like extravagant replication despite it being way too damn slow to be effective. i just want to copy doubling season with it every turn.