The good folks at SamFirmware have gotten their hands on the Gingerbread firmware for the Samsung S5570 Galaxy Mini and S5660 Galaxy Gio. The firmware runs on Android 2.3.3 update and is dated May 7 and June 2 respectively.
Now Samsung has already announced that they will be releasing a Gingerbread update for these phones. But if you are feeling particularly impatient, you can head over to the source link and install them on your phone. Do note that these firmware are in beta and not the same as the one that Samsung will officially release. So we would suggest that you show some restrain and wait for it.
Source (Mini) • Source (Gio)