Hi is the offical answer from 3 mobile UK
" They’ve [Samsung] advised us due to the limited internal storage of the device that Portal cannot be upgraded to the full Froyo version. In fact as it stands Samsung will not be relasing Foryo for Portal [Spica] for any operator."
Have a look here to view it on the 3 site Samsung Galaxy Portal – video Welcome to the Three Blog
So 2.2 is not coming to the I5700 (spica - galaxy portal or whatever its called in your country) from 3 mobile.