Gosselins' Big Announcement Stay Tuned

6/22/2009 1:03 PM PDT
Jon Gosseiln celebrated Father's Day like a devoted dad should -- by signing autographs and shamelessly pimping out the TV show documenting his family's demise.

Jon, minus Kate, gabbed away outside his Pennsylvania home yesterday -- giving no insight to what tonight's "big announcement" will be, though still wearing his wedding ring.

Most telling: When asked where Kate was, Jon said "I have no idea."