Yes, this is what Johan said in Dev Diary #10:
Originally Posted by Johan View Post
"Firstly we have added the infinite order, for something like convoy escorts, you send you fleet out and the order will run indefinitely. With an added twist, each naval base can also be set up with a pool of reserves. These sit in port, repair if they need it, upgrade if they can, but when ever a fleet that is on an infinite order needs to return to port these ships will be used to replace them (providing they are of the same type). Thus if your ships, have low org, or are damaged, rather than having to go to all the trouble of sending a different fleet out on exactly the same order the system will take care of this automatically. What we’ve tried to do is hold down the planning overhead for your missions, yes you may want to go back from time to time and adjust them, but as long as things are going ok you can leave your naval units to get on with it."