Have you noticed Thread Display Options in the bottom of each forum?
When you visit a forum you can view the topics from the last day, week, month, year, etc
Yeah, I've just checked it. BUT it works only within a selected forum section. There are still no any way to get the last post's list for all the MasterRussian forums in a row as it was with the old forum. Now everyone caused to dig every forum's section (20 or 30?) manually and select last posts within each section.

bitpicker
There's also a "New Posts" button which gives you a list of posts written after you last read the forum.
The "New Posts" button has the same link as "What's New?" so the result is the same.