Enable easy preview of any screen(s) and linking to those screens on Zeplin from within Jira issues.

Illustrator is still a contending tool, is it in the plans?

It's pretty new but promising:

https://affinity.serif.com

Adobe XD support!

There are some transitions that can't be easily explained with prototyping tools. It would be great if there were a way to import a .mov and animated .gif or an animated .png. It could come in as reference and not need any callouts, dimensions or code snippets just display.

Yesterday i wanted to work in an offline situation, but i had to connect my macbook via iPhone to the internet to see the screens i'm working on

Add ability to duplicate a project, which means if you want to create a new version of a project you have to start from scratch with content, and members (yes, you have to individually invite every member to the new project, see next point).

Tagging is nice but it's not the solution we need to organise our files. We're having trouble organising multiple pages, page flows and component flows across multiple breakpoints on large scale projects. If we could create folder structures for pages it would make life a whole lot easier.

Convert SVG assest to VectorDrawables for since Android cant load SVG out of the box. You can load a VectorDrawable out of the box.

see https://developer.android.com/training/material/drawables.html#VectorDrawables
and for converting svg to vectordrawable see http://inloop.github.io/svg2android/

Provide plugin for Adobe XD, just like sketch plugin,
so that it will be very easy to develop the product.

Instead of px measurements generated in the font style CSS, support rem and em measurements.

Ideally with an option to set the html base font-size. (Bootstrap 3 for example sets html's font-size to 10px, which allows 1.6rem to equal 16px, unless someone edits their browser's options to increase font size.)

SAML support would help us give a more secure access to devs in a large company

Can import Photoshop files and generates specs automatically

Similar to the Slack integration suggested, a method with which HipChat can get notified when changes are made. In our HipChat, commits and builds are put into the chat whenever developers make changes. Would be cool to have my design changes being integrated too.

It would be absolutely amazing if you can "export" a document (pdf?) with the details. Like a document for developers.

I wish to be able to export SVG assets for my iOS project type. It's nice to have that I have that capability with web projects, but it becomes more limited for iOS/Android.

Add an embed feature which will allow users to embed a single Artboard on a web page?
We post our user stories and journeys on a web based platform to share between the Business, designers and developers and it would lie amazing if instead of uploading images we could just embed a Zeplin artboard. This will mean an entire project can reside in one location.

Love when my apps have the option to toggle Dark Mode so that my eyes are less strained when I'm working. Would love the same option for Zeplin