Hello,
My main blocking point right now, is that I can not attach files to SharePoint list via PoweApps edit forms.
I can create app which can manage orders in SharePoint list for my company in few seconds, but we are forced to keep original email request in list. For this we are using InfoPath which works fine, but PowerApps should be much more suitable solution.
Also we are using same procedure but with excel forms, for that is also important to be able to EDIT excel/word... attachment directly on SharePoint. So what I would like to have in DisplayForm/edit form, when I click on excel file attached, it will open my excel, let me edit it and save it back directly to SharePoint like is possible now with forms on SharePoint.
Once I will have those 2 things in PowerApps, my live will be much more easier! 
Would like to use PowerApps in our company, but right now... its not possible
Review details on this feature release in the following blogs and video tutorials:
Thank you,
Audrie