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a la expectativa de

A Spanish-English Dictionary (Granada University, Spain), 14.4

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a la expectativa de
= on the lookout for.
Ex: The first weeks are vital, and after that the shop must be constantly on the lookout for ways of stimulating further interest and re-awakening those who lapse.
 
estar a la expectativa de
= be on the alert for.
Ex: Of course the perceptive librarian is on the alert for signs of this reaction on the part of the reader, but, sad to relate, there are those who will be deterred by nothing short of a loud cry of 'Stop'.