It looks like the new Ants S2 and other ASIC's are in their 'test' phase, way too many blocks are being found by some private pools in the last few days
By the time they get delivered to their new owners, many of them would have paid it-selves 
Sadly there isn't really any other SHA-256 currency offering better profitability than Bitcoin, so most of them would be pointed at Bitcoin, increasing the difficulty sharply