No, it will not. The information about the creation of the new datafile will be recorded in the redo logs, so the controlfile of the standby will be updated accordingly, but the file will not be created on the standby siteautomatically. You have to copy the new file manually from primary to standby site.

You have to copy it immediately after creating it on the primary site, before the redo log that contains the information of the newly generated datafile gets transfered to the standby site. If standby system can't find the file when it updates the controlfile with the information of this new file the recovery process will terminate and you'll have to restart it after manually adding the datafile to the instance.

It is the similar principle also when you want to rename the file on your primary site.