I've rooted it! Let's go for the steps! First of all, you'll need a linux box!
1) Flash the first leaked GB full SBF. 2) Flash the latest leaked GB fixed SBF. 3) Root the system using Gingerbreak and install Terminal Emulator from Market. 4) Make a image of your system partition block device: "dd if=/dev/block/mmcblk1p21 of=/mnt/sdcard/systemimage.img bs=4096" 5) There'll be a copy of the system partition in your sdcard. We gonna take the binaries and permissions from there, but if you know where you can get them easier you can pretty much jump step 4). 6) Extract CG39 from latest leaked SBF (I've used SBF Depacker from Skrilax_CZ) and copy it to your sdcard, side-by-side with systemimage.img) 7) Boot your linux box and open your sdcard. Mount both images: mount /path/to/sdcard/systemimage.img /path/for/mounting/systemimage/ -o loop mount /path/to/sdcard/CG39.smg /path/for/mounting/CG39 -o loop 8) Now let's copy files: dd if=/path/for/mounting/systemimage/system/bin/su of=/path/for/mounting/CG39/system/bin/su dd if=/path/for/mounting/systemimage/system/app/Superuser.apk of=/path/for/mounting/CG39/system/app/Superuser.apk 9)Setting permissions based on original files: chmod --reference=/path/for/mounting/systemimage/system/bin/su /path/for/mounting/CG39/system/bin/su chmod --reference=/path/for/mounting/systemimage/system/app/Superuser.apk /path/for/mounting/CG39/system/app/Superuser.apk 10) Umount everything. Your CG39.smg now is rooted. Time to write it back on the phone. Unplug it, go to Terminal Emulator and type "dd if=/mnt/sdcard/CG39.smg of=/dev/block/mmcblk1p21 bs=4096". 11) Wait until dd says it has copied xx blocks. Your phone will be crashed, so pull off the battery and put it back again. Your phone is rooted!
IMPORTANT: Don't try this if you don't know what you're doing. This is not easy and you definitely must have a lot of experience with Linux and its commands, notably dd and mount. dd is so powerful that it can wipe all your computer data if used wrong. Be careful, again. Only do it if you know exactly what every command does. You've been advised.