I don’t think I ever used 10.8RC1 at least not that I know.
I don’t have any table like notification_filter_preferences.
mysql> show tables;
+-------------------------------+
| Tables_in_xwiki |
+-------------------------------+
| activitystream_events |
| activitystream_events_status |
| activitystream_events_targets |
| feeds_aggregatorgroup |
| feeds_aggregatorurl |
| feeds_aggregatorurlgroups |
| feeds_feedentry |
| feeds_feedentrytags |
| feeds_keyword |
| mailsender_events |
| xwikiattachment |
| xwikiattachment_archive |
| xwikiattachment_content |
| xwikiattrecyclebin |
| xwikicomments |
| xwikidates |
| xwikidbversion |
| xwikidoc |
| xwikidoubles |
| xwikifloats |
| xwikiid |
| xwikiintegers |
| xwikilargestrings |
| xwikilinks |
| xwikilistitems |
| xwikilists |
| xwikilock |
| xwikilongs |
| xwikiobjects |
| xwikipreferences |
| xwikiproperties |
| xwikircs |
| xwikirecyclebin |
| xwikispace |
| xwikistatsdoc |
| xwikistatsreferer |
| xwikistatsvisit |
| xwikistrings |
+-------------------------------+
38 rows in set (0.00 sec)