The Screener - Sovereign (SOV)

Yesterday my options screener popped out SOV June30 calls as being unusual since nearly 10k traded on open interest of zero. I refrained from reporting on it thinking it might have been some sort of positioning because they were new contracts. Yes, positioning, but perhaps on takeover talk? The tell tale sign? Options volatility in the May calls has racheted into the 30+ area, up about 20% in recent days.