Ripple Labs has transferred 150 million XRP to an unknown wallet, sparking speculation about its intentions.The transfer comes at a time when rumors of an XRP Exchange-Traded Fund (ETF) are circulating.The wallet receiving the XRP has been regularly receiving transfers from Ripple since October 2023, leading to various theories among XRP proponents.The concept of an XRP ETF has generated positive sentiment, with XRP's price rising 11% in the past week and trade volumes increasing.