You can edit the html templates right now.... from the File menu choose New HTML Template...
Although not everything is clear & some fields aren't demoed, you can put notes into the task list template & it does work in beta 5.
Here's a sample:
<table cellpadding='4' cellspacing='0' border='0' align='center'>
<tr>
<td class='header'>ID</td>
<td class='header'>Task</td>
<td class='header'>Notes</td>
<td class='header'>Start</td>
<td class='header'>End</td>
<td class='header'>Duration</td>
<td class='header'>Completed</td>
<td class='header'>Dependencies</td>
<td class='header'>Task Cost</td>
<td class='header'>Assigned</td>
<td class='header'>Planned Start</td>
<td class='header'>Start Variance</td>
<td class='header'>Constraint Start</td>
<td class='header'>Planned End</td>
<td class='header'>End Variance</td>
<td class='header'>Constraint End</td>
</tr>
{@Tasks@}
<tr class='{@Task Type@}'>
<td>{@ID@}</td>
<td>{@Title@}</td>
<td>{@Notes@}</td>
<td>{@Start@}</td>
<td>{@End@}</td>
<td>{@Time@}</td>
<td>{@%Done@}</td>
<td>{@Dependencies@}</td>
<td>{@Cost@}</td>
<td>{@Assigned@}</td>
<td>{@Planned Start@}</td>
<td>{@Start Variance@}</td>
<td>{@Constraint Start@}</td>
<td>{@Planned End@}</td>
<td>{@End Variance@}</td>
<td>{@Constraint End@}</td>
</tr>
{@/Tasks@}
</table>