for the short term, i added an additional class for sticky / announces to the tpl that renders the HTML.. ie: class="newintopic sticky" ...
*drumroll* 'sticky' for stickies and 'announcement' for announcements
yah yah, i know i used some obscure naming there
soooo, you can easily add your sticky and announce classes to the 'Extra CSS' section for each theme for the mean time..
by 'mean time', i mean.. 7.3... there is no official new class that you style in the admin editstyle.php world ...
having the extra class does nothing to affect any existing styles at all, so it's at worst harmless
