At this momment we do not have plans for subprojects and review tool. But we will consider them, as possible future features.
Epics or something like that seems a interesting feature. I will put it on our backlog.
Thank you very much!
No worries... Keep up the good work. Having used Jira for several years, along with Github issues and some other software for managing Projects within Projects, Epics or Milestones really help for keeping things together.
Review Tools are nice if you don't have one already in place
Also, is there any future plans for building in some sort of review tool?
What do you exactly mean by review tool?
With the Atlassian Tools, there is Crucible which allows you to pull in revisions to be able to compare and diff files and post comments.