Does the developers work on the expansion and if so when will it be released and be able to play without any bigger issues?
Here's an not that quite old but few months ago at least which was the last information about WoD and if it should be released, devlog from April 16, 2015.
"Warlords of Draenor public test realm has been delayed to overcome unforseen technical difficulties. As with any other expansion we have released in the past, a substantial amount of it must be playable or up to our standards. A closed test realm has been launched instead to further develope on. We will have further updates as we progress to a publicly available realm."
Since April 16, 2015. Is there any information about what's happening, if WoD even ever will be released at Warmane in the future?
(In case I've missed some information about Warlords of Draenor, please link or tell me below in the comment section, thanks.)
They left WOD on the backburner to be honest... They should not lay any resourses on WOD and focus their current expansions and Lordaeron + porting over content from that serv to the other servers :)