The past three years have witnessed rapid empirical efforts to understand the affordances, risks, and tensions brought by Generative Artificial Intelligence (GenAI) in second language writing. This poster presentation synthesizes pedagogical insights from a scoping review of 88 empirical studies on GenAI in multilingual writing published between 2023 and June 2025. The review highlights empirical findings on GenAI-mediated feedback provision, the effects of GenAI on writing performance and writing development, as well as emerging work on prompt engineering for writing tasks. The poster presentation offers a list of empirically grounded recommendations for leveraging GenAI when working with multilingual writers in higher education.