Junior looked bad in the final episode of season 4. I don't think he'll get whacked, but rather natural causes.

Paulie Walnuts might get whacked, but when he found out that Carmine had no idea about him, he might be looking to extract some revenge on Johnny Sack. And since there is a storm brewing between New Jersey and New York, I'm guessing Tony could have Paulie whack Johnny Sack, reassuring both his loyalty and his devotion to the Soprano crew...

Bobby Bacala hasn't been mentioned anywhere lately, I love his character, and I wonder what will happen with him and Janice in Season 5.

I'm surprised that Furio won't be back, although I don't think he's gone forever. Something tells me his love for Carmela may bring him back...who knows, I could see him coming back to end the series 6 by whacking Tony...