The latest blog I see in welcome screen is "Adam Bien: The importance of Java EE...." from Jan 17.
When I click on "All blogs" I see new articles from March: http://planetnetbeans.org/?utm_source=netbeans&utm_campaign=welcomepage
I guess something is broken generating the content for the IDE's welcome screen.
welcome screen reads the feed list from here:
Those feeds were stuck since January. I have fixed that and they are now up to date so Welcome Screens should display current items as well..