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 HTCmania
There 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
PDA: S5830XWKS2
MODEM: S5830XWKS2
CSC: S5830XENKS1
S5830XXKPO SER – Russia
PDA: S5830XXKPO
MODEM: S5830XXKPO
CSC: S5830SERKPO
S5830XWKS3 VIR – Virgin Mobile UK
PDA: S5830XWKS3
MODEM: S5830XWKS2
CSC: S5830VIRKP1
S5830XWKS9 XEO – Poland
PDA: S5830XWKS9
Phone: S5830XWKS2
CSC: S5830XEOKP2
GT-S5830_XEO_S5830XWKS9_S5830XWKS2_S5830XEOKP2
http://www.filefat.com/ykaofw6eigcx
http://www.multiupload.com/WQCDMTLMAW
S5830XWKS9 XEN- Netherlands
PDA: S5830XWKS9
MODEM: S5830XWKS2
CSC: S5830XENKS1
GT-S5830_XEN_S5830XWKS9_S5830XENKS1_S5830XWKS2
http://www.filefat.com/b19zevs2x87f
http://www.multiupload.com/ZARDDQBMV7
Pass: sampro.pl Posted at XDA by Przekret
The stock ROM can be flash as “ONE Packaged” using Odin. see the guide here
OPS File
ODIN Multi Downloader v4.38