A 60-year-old man with previously diagnosed Idiopathic Pulmonary Fibrosis (IPF) presents with acute worsening of breathlessness and cough over the past 3 days. His oxygen requirements have increased significantly. A high-resolution CT (HRCT) scan of the chest shows new widespread bilateral ground-glass opacification and consolidation superimposed on the baseline pattern of honeycombing and traction bronchiectasis. Sputum cultures and viral swabs are negative. What is the most likely diagnosis?