I just noticed, that since ~june 2015 egit contains gitflow plugin (org.eclipse.egit.gitflow & org.eclipse.egit.gitflow.ui) making it easier to use egit with topic branches etc.
This was originally requested by rhn-support-ggastald here: JBIDE-9080 and initilally implemented here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=348610. Since then, gitflow plugin for egit has its own component in bugzilla: https://bugs.eclipse.org/bugs/buglist.cgi?component=Gitflow&list_id=15354082&product=EGit&query_format=advanced and it seems like the it's used and developed actively.
I'd like to open discussion whether we want to include this plugin or not. I personally think we (and our users) can benefit from such feature.