I think we all would like an official confirmation about release date. Although there are other interesting questions too. For example I have read that Warlock and Priestess sets will be sold as two separate products. In that case will they have cards only from their Magic Schools or will they have additional flavor for Wizard and Beastmaster as well?

Lets say i spend 12 mana on some creature (casting cost and enchantements). I attacked first and after its activation, i cast sanctuary. Now my heavy creature is safe, my oponent need to target something else.

I think you are mistaken. When you attack with a creature it makes it inactive. If you reveal Sanctuary afterwards you will remove an inactive creature from the board. Since Dissipate token is removed during Upkeep Phase which is after Reset Phase, on your next turn the creature you bring back will be still inactive and will not be able to attack again. Correct me if I'm wrong.