XDA-developer member alvarorojas4 from Bogotá Colombia confirmed that this version is much more faster than previous 2.3.4 and 2.3.5.
Today I tried to update via OTA (Over the air. In the System Updates menu) and for my surprise it said that I can update my firmware so, I updated and Now i'm in 2.3.6 there are a few small changes, for example at the final of the scroll will appear a blue light, AGAIN is faster how in 2.3.4 (For me 2.3.5 was laggy) and I guess that more improvements...
The S5570LWMKPJ stock ROMs is also available online on XDA developer and can be flash using Odin tool. See the thread of przekret here to grab the said S5570LWMKPJ stock ROM. And now also added to our Galaxy Mini firmware update list.
If you prepare Odin or Kies just ensure to wipe data and cache in recovery of your mini to get the freshest firmware upgrade.