I fired up 9.0.2 and got a dialog saying a 9.0.3 update was available. So I click on the Download and Patch button. The download occurs, IDEA restarts, and ... still 9.0.2.
After reading about some of the 9.0.3 JSP performance issues, I'm kind of glad as I'll just wait until 9.0.4 is out.
Still, I thought I'd share my experience in case someone knows why the patching doesn't work.
OS: Windows 7 Ultimate 32-bit; 3.8GB RAM.