Amazon UK is selling the R4DS v3:
Here's what they list as the Technical Details:

* TeckNet New English Version 3, updated and redesigned the older version R4 by using new hardware and software, the NEW TeckNet R4 can support Hight-Speed 1G, 2G, 4G & 8G Micrso SD card
* New Benefits than older version V1.18 R4

1. Using the newest V1.20 kernel, Support more games than older V1.18 R4

2. Using new hardware, Support High Speed 1G, 2G, 4G, and 8G memory card.

3. Using new hardware, will save 23% battery power than older V1.18 R4
* 3nd generation storage device, Flush fitting slot 1 card, Uses MicroSD card, FAT16 or 32

Automatically detect save type, Save directly to MicroSD card, not to onboard chip, Supports Moonshell and other homebrew. Open I/O interface, User friendly skinnable interface. Touchscreen or button operation
* Supports rumble pak and memory pak, Supports the WiFi game, DS Rumble Pak, DS Browser, Supports Action Replay cheat, moonshell 1.6 support Software Reset function( Press START key back to the R4 menu)

* NO MEMORY CARD INCLUDED - THIS MUST BE PURCHASED SEPERATELY