United Linux --- SuSE Linux

Hi, this maybe slightly off topic, but since my main points are security and manageability of production servers ill ask away: Since United Linux seems to be focused on the "professional" side, like internet servers, how will the upgrade onto a new release level work? As it does now, via an Update CD / Yast2? Ive had bad experiences with SuSE upgrading, but maybe there is something planned so the "on the fly" upgrading is possible? How long (approximative :) ) will security fixes be maintained (how often do you have to "reroll" to a new release)? Will there be "joined" security updating or will it be vendor specific? Peace, Tom