Perhaps Wakemate learnt from the late-release PR disaster and have decided it's better to offer pessimistic worst-case-scenario delivery estimates and over-deliver than to offer over-optimistic delivery estimates and under-deliver.
That seems to be exactly the case. This is the full passage from the email:
The next batch of units will ship no later July 30th, 2010. Based on your pre-order date (11/24/2009), you should expect your WakeMate no later than 07/30/2010, but probably significantly sooner. This is a conservative estimate; we want to provide you with a firm date. We are confident we can deliver many orders sooner and will continue working day and night to ship yours as soon as possible.