Yes, 8.1 will require a dump/reload for upgrade. I think we decided that was going to be necessary.
That has aleady happened for 8.1:
date: 2005/02/28 03:45:21; author: neilc; state: Exp; lines: +2 -2 Implement max() and min() aggregates for array types. Patch from Koju Iijima, reviewed by Neil Conway. Catalog version number bumped, regression tests updated.
Yes, as well as 4 other patches that have bumped the catversion number. I think we are well past the point at which an 8.1 without an initdb would be a plausible option (barring the materialization of a working pg_upgrade tool, of course).
-Neil
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