As I predicted 2 years ago Palm has expired. The company purchased by HP last year has been absorbed and it's 2 newest products, the first since that acquisition no longer carry the Palm logo.
While WebOS is still the best smartphone OS in my opinion, the delay in the release of these 2 phones, does nothing to help their chances of making a big splash. They are completely out of cycle. This announcement should have been made at CES a month ago.
Only the fact that they are HP products gives them any chance at success. They are running uphill against the iPhone, the new Motorola Atrix other Android powered phones, and Blackberrys. I'm not sure they have what it takes to stand out from the crowd. Attention spans are so short these days. By the time they are released this summer everyone will have moved on.