MODFREAKz posted pictures of an Xbox 360 (MFR Date 2009-09-20) with a somewhat updated motherboard revision. No huge changes, so it's probably still a Jasper.

It seems to have a new GPU-revision (Kronos1), new RF-module and some small layout changes. CPU, HANA, southbridge, 16mb NAND, RAM are same. No heatsink changes either, MS stopped using the 2nd GPU heatsink/pipe a while ago already.
The DVD drive is a Lite-On DG-16D2S 93450C-2.
The CB/CD are of course JTAG-fixed as with any 360 made since ~mid-June.