Hello found this on www.maemoworld.ru
someone who ACTUALLY DID FLASH HIS PHONE WITH THE LEAKED firmware.
Some changes he noticed:

1) Map
- A "route recalculate" button is added to the upper left in routing mode.
2) hildon-desktop & modest:
- Latest git version as expected.
- Live search now shows the word you typed immediately even if you are in a folder with large number of files.
- Gas-ball FPS is much higher. Could be h-d or driver update, though.
- For apps supporting portrait mode, the transition to portrait now feels snappier or should I say sure-footed.
3) Microb (20100401-1.9.2-5.2+0m5/2.9.5-1.23+0m5):
- No "open link in background" option.
- In fullscreen mode, reflow keyboard shortcut still turn into auto focus on address instead.
- Feels better to use: loading page is faster and click is snappier.
4) PulseAudio (0.9.15-1maemo43+0m5)
- Seems to have less stuttering under heavy load.
5) Camera:
- No visible change in options.
- Auto focus speed seems to be a tad quicker.
- When front camera is used, say by Mirror, the indicator light turns red.
- Video still has frame-drop issue. I have it in both HQ and fine setting...
5) QT4.7: Some QT packages will need updating to work properly.
6) Dual boot: Errr... I don't know how to test this.
7) New sgx driver seems to be better as overall experience is smoother.
8) Some apps are broken due to dependency and version issue.
9) Flash is the same as PR1.2 at least on 36-2 build.

On the site you can find a link to RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.zip for download.

Link to forum maemoworld.ru :
http://forum.maemoworld.ru/viewtopic.php?id=3036

link is in 1st post click on tyt*
you will redirected to download site
So if someone is willing to try????