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According to Chase it will take over a year for WaMu accounts to merge over to Chase so they want WaMu to continue functioning fully and increase the number of customers that they will have.
My2cents
I received a similar offer from WUMA with the 0% on purchases, However, in order to qualify for the 0% you would need to a balance transfer of at least $100.00 at 8.9% (variable) APR.
Of course they will apply payments to the lowest APR and you will continue to charge 8.9%(variable) APR on the balance transfer.
If you have no other restrictions on your offer, then go for it.