The website for it says 11th of September is the current release,

but if you actually download the details from the real download site (http://tablets-dev.nokia.com/maemo-d...-downloads.php)

The release notes say:

* MAEMO SDK VIRTUAL DESKTOP IMAGE DETAILS

- Image version: Maemo SDK Virtual Desktop Image - PreFinal 2
- Image release date: 07.10.2009
- Virtualization techniques supported: VMWare, VirtualBox, QEMU
- Estimated size: 7.9GB (normal) and 2.7GB (compressed - zip format)
- Image download link: http://tablets-dev.nokia.com/maemo-d...-downloads.php

- Ubuntu base release infromation:
- Distribution: Ubuntu Intrepid Ibex
- Version: 8.10
- Edition: Desktop, Intel x86
- Date: 30.10.2008
- URL: http://releases.ubuntu.com/intrepid/

- Maemo SDK base release infromation:
- Distributions: Maemo Fremantle 5.0 SDK Final and
Maemo Diablo 4.1.2 SDK Maintenance

So from reading that, its more up to date than the website actually says.

Cheers
Rip