Getting Menez doesn't imply we will switch formations even for tactical reasons. We need 2 wingers to play a 4-3-3
I think Conte would be more inclined to do so because he'd have much more faith in Menez than in Giovinco. It's actually the quality of the players that counts for Conte, not really the scheme.
You see, now that Osvaldo is here, playing well, Conte develops immediate trust on him and starts rotating a lot more with Tevez and Llorente.
The same for the 4 guys and 3 spots in the mid.
Caceres is regaining his full trust and I bet he will rotate more often from now on. The same with Isla.
It's just a matter of quality of the player and confidence by Conte, who clearly does not give much opportunities for a player to gain his trust. He's not very patient.
I feel that Menez would be similar to Osvaldo - would arrive already with some expectations from Conte, which would lead to more rotation uprfont and scheme change - with Isla/Giovinco playing more often, or even Marchisio/Vidal/Pogba playing in more advanced positions in the mid.
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Hopefully Ogbonna is the one to gain his trust next season.