To my knowledge last SUPEE update was in March/April 2016. Any ideas when to be prepared for another SUPEE update for 1.x versions?
closed as primarily opinion-based by Raphael at Digital Pianism, Amit Bera♦, 7ochem, Rakesh Jesadiya, Qaisar Satti Aug 22 '16 at 11:49
Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.
The disclosure of potential security exploits to Magento platforms is not publicly available. If it were, you'd just see floods of exploits hitting your site whenever one was reported.
As such, you're not going to be made aware of fixes for these exploits until they're physically released to the market in the form of a SUPEE patch.
Essentially, no - it's unlikely you'll be able to find out when security patches will be released. Just follow the Magento security listing pages and keep an eye out.