From D-Link Release Notes:
DSM-G600 revB firmware 1.02 release notes
1. Will now receive DHCP in wireless client mode after a reboot.
2. Wireless Access Point settings will now visibly save instead of
   seeming to disappear.
3. Improved UPnP AV Media Server – Compatibility and Reliability
4. When formatting a USB drive with existing partitions, the existing
   partitions will now be deleted.
5. If there is no DHCP, the default IP address will now be 192.168.0.60.
   This will help avoid common conflicts and confusion.
6. Added USB drive information on the Status page.
7. Shutdown via long-press of the power button will now cause a shutdown
   in all circumstances.
8. The default path for the UPnP AV server is now ROOT.
9. Files and folders downloaded via FTP or Download Scheduler are now
   able to be deleted normally.
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From DSM G600 Hack forum:

Also I believe that they have changed something at startup chmod script
(/etc/hotplug/idemount).

I have uploaded it to http://download.dsmg600.info/firmware
And as usual to extract kernel:
Code:

dd if="DSM-G600_fw_v1-02us(1.49.1019.2006)" bs=$((0x000080)) skip=1 | gzip -dc > kernel

and ramdisk:
Code:

dd if="DSM-G600_fw_v1-02us(1.49.1019.2006)" bs=$((0x0d077f)) skip=1 | gzip -dc > filesystem.ext2