#1 - March 2, 2015, 8:22 p.m.
As a point of clarification when we're not actively testing an upcoming release(such as now), the PTRs can and will go down without warning or updates. The PTR forums are not actively monitored by the Quality Assurance (QA) department when no scheduled testing is ongoing.
When there is an upcoming release that is ready to be tested on the PTR we'll be sure to post that information here on these forums.