There are 16 issues listed, most minor: https://issues.apache.org/jira/issues/?jql=project%20%3D%20CB%20AND%20fixVersion%20%3D%20%222.4.0%22%20AND%20resolution%20%3D%20Unresolved%20AND%20component%20%3D%20iOS%20ORDER%20BY%20priority%20DESC
...which will be moved to 2.5.0. Haven't gone through all of them yet, so if they are assigned to you see if they are important enough to be in 2.5.0.
