Master Promotion Scroll is now available in sGE. In addition, there is an in-game event. Promote 3 characters to master and get 3 Morado Puesta de Sol wings. The event is valid during 2-30 July 2009. See The Master's Race for more event details.
See here for cash shop upgrades. There is also a promotion for players who top-up to get 20% more G-Points from now until 30 Sept 2009. See Back To School Promotion.