Moosaa Richardson explains how nisyaan, or "forgetting" someone or something, is of two types (in both Arabic and English!), and how we understand both of these attributes as it relates to our Magnificent and Perfect Creator. In summary:
We affirm that Allaah forgets some people specifically in the Hereafter. (Interesting! Listen, before jumping to conclusions!) We also negate that Allaah forgets in a general way.

From class #30 of our Sharhus-Sunnah course, as recorded at Masjid Ibn Mas'oud in Cleveland, Ohio (USA) on 1437.10.19.