The tab key is not increasing list level if the list is contained in a table.
I make extensive use of multilevel lists within two-column tables and in this Beta I can no longer increase or decrease the level of items in these lists using tab or shift+tab. Instead, tab just moved my cursor to the adjacent table cell. It seems like the only way to increase/decrease the level of a list item now is through menus: Format > Lists > Increase/Decrease list level.