1. Donald Hallstrom. We can be sure that at least one member of the presidency of the seventy will be called as an apostle. Elder Rasband has a very very good chance but I am going with Elder Hallstrom.
2. Gerald Causse. Most people focus on the seventy as the body where new apostles come from, but the presiding bishopric is also an option. Given the complexity of the Church it makes sense to include leaders who have served in the presiding bishopric. I've been extremely impressed by Causse, he reminds me of elder Uchtdorf in some ways.
3. Claudio Costa. He is the president of the Brazil area and has been a general authority since 1994, including time in the presidency of the seventy.
I would be very happy if these three brethren got the call.