We know that all of the Galaxy S phones are bound to receive Android 2.2 at one point or another: this launch is too big for Samsung to leave even one crowd out of the picture. At least for one market, however, we can extract a broad-sounding window for its release. The Samsung Galaxy M110S (aka the Korean Galaxy S) will apparently be seeing Froyo in the earlier days of August.
Samsung Hub learned this from their contact within the company who states that all of the custom UI features (TouchWiz 3 and all that comes with it) will remain intact. Given that time frame, we can only hope that other markets and carriers will follow suit around the same time.