The trouble is any hype around this was last October when it first leaked it was happening. By the time it aired about 8 months later even those who were intrigued by the prospect when it was announced will likely no longer particularly care.
Based on the last couple of years though should we be expecting promos soon, perhaps as soon as next week after the Olympics? The trouble is they'll almost certainly build all the promos around the returning housemates, putting the newbies at an even bigger disadvantages than they were already at.