OP, don't forget our new 50% damage reduction cooldown at level 64:
10% of Base Mana. 3min Cooldown.
The Warlock hardens his skin, reducing all damage taken by 50% and preventing all spells from being interrupted for 12 seconds.
Also in case you missed it - Demon Armour gone, Fel Armour giving Armour, 10% more healing generated through spells and effects, and 10% stamina. This is just slightly below what the other tanking classes (bar Monk, haven't researched them too much) get passively as a stamina bonus - if I recall correctly, currently Bears get +20% stamina, Prot Warriors and Paladins get +15%, and Blood DKs get 9%.
Edit: The OP linked a thread on the US forums regarding the subject, and a poster there (forgot who it was, sorry!) mentioned that "With the current setup, Warlock Demonology tanks would be too good, could mitigate too much damage). When I thought about this, looking at how Nether Plating would scale even my shoddy cloth armour to ridiculous levels and the potential damage reduction numbers making my head spin, I realised that Demonology Warlocks tanking would more than likely have absolutely no avoidance. Thus, the higher armour, and more defensive cooldowns and passive damage reduction, would be a necessary to allow Warlocks to continue to use their cloth DPS gear without needing to create who new sets of cloth armour with defensive stats for one spec of one class.
You would have to spec/glyph in a very specific way, but as far as this dream getting the proverbial green light goes, there just needs to be confirmation of a passive buff to threat generation.
Then my dears, hearts will be skipping beats. :)
Edited by Buxtwit on 22/03/2012 17:30 GMT