Probable starting eleven:

Palermo:
Sirigu, Cassani, Kjaer, Bovo, Balzaretti; Migliaccio, Liverani, Bresciano; Pastore; Budan, Miccoli

Fiorentina:
Frey, Comotto, Gamberini, Felipe, Pasqual; Montolivo, Donadel; Marchionni, Mutu, Vargas; Gilardino

Fiorentina last games were full of goals. Couch Prandelli is playing open football, no matter home or away. Just look at last five games Fiorentina played:

January 20 v Lazio (H) - WON 3-2 (Coppa Italia)
January 17 v Bologna (H) - LOST 2-1 (Serie A)
January 14 v Chievo (H) - WON 3-2 (Coppa Italia)
January 10 v Bari (H) - WON 2-1 (Serie A)
January 6 v Siena (A) - WON 5-1 (Serie A)

As You can see, all five games ended with Over 2,5 goals, and even more, three out of five games ended with Over 4,5 goals. So, what can we expect today? I think something similar. Fiorentina have two danger attackers, Gilardino and Mutu. They are extra class attackers and together with Jovetic (injured) took Fiorentina in 1/8 final of UEFA Champions league.

What can we expect from Palermo? Can they play anything else then open football in front of their own fans? I doubt. They must accept open football and try to score more goals. Coach Delio Rossi is doing a great job until now and Palermo is just three points off the top four. Maybe Champions league place is too much for them, but the fans surely dream about that. Palermo home form is good as they have won six out of ten league games at the Renzo Barbera stadium (other four games ended with draw, so no single lost so far).

As conclusion, I expect an open game from both sides and at least four goals.