Last year when Kraken and Manta were closed for their repaints, the closure was listed on the individual ride's page. So if there is no closure listed there, I think it's safe to assume everything will be open. Atlantis could be a wild card though.
In 5 hours you will get on everything with time to spare. Even on the busiest days, I have never seen Mako's wait over 10-15 minutes. Most of the time it's a walk on since the capacity is just excellent and dispatches are solid. If there is any sense of crowds, Manta will be the busiest due to the horrid operations. Kraken and Ice Breaker will be in the middle.
Have fun. It's a great park. And like ^ said, next week will likely be deserted.