This week's "Five on Friday" Q&A feature on the official Ultima Online website covers questions about the gargoyle flying ability, the global chat system, and more.
Under the new SA client will the gargoyle charactor (when flying) be able to cross mountain ranges or (if not) go further up the slope so to speak? and will they be able to cross open water without a boat? like other flying creatures such as birds and mongbats.
There will be *some* areas where they can do so, but it won't be a carte blanche ability to cross terrain like you've described. For instance, the Shrine of Singularity in Ter Mur can only be accessed by flying over a mountain path. We're definitely interested in pushing the envelope without causing any gamebreaking behavior, though.