They'll pull back later or sooner. It's clear there's no itention to annex some other part of Georgia (except SO and Abkhazia, of course - and just before the conflict there was no intention to annex them (on official level, although many thought otherwise).
edit: although there's some chance now they may try to establish a military base in Georgia "in order to prevent hostile actions in future". Just my assumption, nothing more.
edit: although there's some chance now they may try to establish a military base in Georgia "in order to prevent hostile actions in future". Just my assumption, nothing more.