Aelobin
DK Twink (80 / 85 / 101)
Still early days with the beta so this could all change.
If you check Wowhead, the level requirement for TBC items is changing to 27, so it's safe to assume level 70s will become level 27 after the squish. However, the level requirement to enter the TBC raids has been changed to level 30. That means you will need to be equivalent of level 80 (30) to get the TBC raid gear but you can still equip it on a level 70 (27) if you already have it.
So unless they fix this, make sure to get all the gear you might need if you plan to keep at twink at level 27 The same applies to level 60 (25) and 85 (32) twinks.
If you check Wowhead, the level requirement for TBC items is changing to 27, so it's safe to assume level 70s will become level 27 after the squish. However, the level requirement to enter the TBC raids has been changed to level 30. That means you will need to be equivalent of level 80 (30) to get the TBC raid gear but you can still equip it on a level 70 (27) if you already have it.
So unless they fix this, make sure to get all the gear you might need if you plan to keep at twink at level 27 The same applies to level 60 (25) and 85 (32) twinks.