Maps, that will be created with the release of the editor won't be available for upload to Battle.net 2.0. Their makers should wait for the full game to ship until they can share their creations with other gamers. This period of time, however, will give a nice opportunity and a great head start for the mapmaking enthusiasts to learn the specific features and scripts of the Galaxy Editor.
Little is known about the aforementioned patch besides that there will be some boosting Marauder-wise, most probably connected with decreased cost and/or research time of Concussive Shells.
Mac users should also embrace this news warmly as a Mac SC2 beta client will be released a few days after the patch.
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