The version number just raises a few digits (from 14.02.01 to 14.02.08), but the improvements are quite huge: S3 Graphics released a new Linux driver for Chrome 500 and Chrome 400 Series with many improvements compared to last release from November (e.g. OpenGL 3.0 and 64 Bit support). The package also includes a patch to MPlayer to enable GPU accelerated H.264/VC-1/MPEG2 video decoding (to make the ChromotionHD Engine working with Linux). Like the last release it's a closed source as well.

Features (look at the Release Notes and the Driver Installation Guide for further informations):

• Linux Kernel 2.6.x
• X.Org X11R7.x with H/W 2D acceleration through XAA or EXA
• SAMM / MAMM / Xinerama with multiple display
• DVI dual-link up to 2560x1600 resolution
• 90/180/270 degree display rotation
• H/W accelerated direct-rendering and indirect-rendering OpenGL 3.0
• Composite Desktop with AIGLX / Compiz 
• Full H.264 (MPEG-4 AVC), VC-1, and MPEG2-HD VLD bitstream H/W decoding through S3G customized MPlayer and VA API driver
  

Suppported GPUs:

• Chrome 440 GTX
• Chrome 430 GT
• Chrome 430 GS
• Chrome 430 ULP
• 4300E
• 4300E+
• Chrome 530 GT
• Chrome 540 GTX 

Links:
Driver page for Chrome 500 Series 
Linux Driver 14.02.08 (2009-02-25)
Release Notes 
Driver Installation Guide