Qlik have various sources for keeping up with the latest information. 

For overall strategy, see their innovation page: Qlik Product Innovation and Direction. This lists high-level quarterly priorities and recent releases as well as links to recent roadmap webinars and the like.

For more granular updates, you can see:

• Qlik Releases Archives - Ometis - Our blog which covers releases for SaaS and, less often, on-prem
• What's new in Qlik Cloud ‒ Qlik Cloud - this covers just Qlik SaaS, not on-prem
• SaaS Release Notes - this covers bug fixes etc in Qlik SaaS - more focussed on admins
• What's new in Qlik Sense ‒ Qlik Sense on Windows - this covers Qlik Sense on Windows
• Release Notes - this covers all on-prem products as well as some aspects of SaaS