JMO but Facey is a bit different from Nolan. Facey is a bit more explosive, from what I have seen and Nolan has a better shot. Both need to get stronger. I think they could actually play next to each other fairly well, if they gain muscle.
Samuel will likely fill the role that Evans is currently playing. I don't know if that will be an upgrade or not next year, more because of the leadership/energy that Evans brings. Samuel has more potential and is a better athlete.
The potential of the team will depend more on internal development than Facey/Samuel, IMO. I don't think either is a game changer as a freshman, though both have a good amount of potential. If Wolf can continue to develop, Boatright settles into being a PG, Napier comes back and plays like he has been (or better), Calhoun works on his shot, Giffey/DD put it together, etc. Decent amount of talent and the added depth will help.
UConn could still add another recruit, but there are only a few game-changing recruits left and UConn isn't really in on any of them, ATM. No other recruit is likely to commit to UConn until the coaching situation is clear.
You also never know who might become available before next year. Montrezl Harrell is a perfect example of a last second recruit, he would have actually been perfect for this team, but didn't seriously consider UConn because of the sanctions. Coaching changes, 5th year seniors, transfers can all change the equation for recruiting.