Btw i'm sad to see mages are still mainly a support class
with all these lures ...
I know we aren't supposed to use them but we were supposed to get a nuke spell but i don't see one ... But if we can now hit more than a warrior with our ice shards
Second thing, will plats be needed to buy these new slots (rings, bracelets) ?
It seems to me, and I'm basing my statements on having read this guide and Teaweasel's Druid guide, that you are limiting yourself by thinking that a Mage is only a support class.
eg. A Mage puts a lot of points into Focus and Vitality, has Ice Shards at 17/25, Cloak of Fire at 17/25 and puts some points into his/her Lures. You could solo quite well, by casting the correct Lure on the mob, and blasting them. You will take less damage (on the attack you Lured), the mob takes damage from your cloak, and you will be hitting for solid damage. Add that DoT spell of yours, and voila.
Aside from that, Mage's have an AoE fire spell... that seams pretty nuke-ish to me.
Regarding your second point, it seems that the item slots you are talking about will be available to everyone (4 rings, 2 bracelets, 1 neck, 1 misc). The slots that require platinum would be if you want skill/spell slots above the new default 8.