The XOOM shipped without Flash but Adobe has announced that it will be releasing Flash 10.2 for Honeycomb on March 18 as a free download. They’re calling it a beta release, but isn’t all Flash on a mobile a beta release? You need have have Honeycomb with the 3.0.1 system update for it. As for improvements:

accelerated video presentation for H.264 for Honeycomb tablets, a new ActionScript API with automatic soft keyboard support for developers and the usual performance improvements

Mark your calendars and charge your batteries.