According to users who already tried it says, it does not have much any difference from previous versions, just a few improvement in usability performance, it became more smoother. The Wifi connection become much faster, some new applications are added, just find out the rest by yourself.
Images courtesy of zagoya from HTCmaniaThere are five Android 2.3.5 Gingerbread Stock ROMs available for Samsung Galaxy Ace for now and will soon be added more since Asian, Arabic and other Regions doesn’t have the 2.3.5 firmware update releases yet. Here’s the list of the previous released including the two XWKS9.
S5830XWKS2 XEN – Netherlands
S5830XXKPO SER – Russia
S5830XWKS3 VIR – Virgin Mobile UK
S5830XWKS9 XEO – Poland
S5830XWKS9 XEN- Netherlands
Pass: sampro.pl Posted at XDA by Przekret
The stock ROM can be flash as “ONE Packaged” using Odin. see the guide here
ODIN Multi Downloader v4.38