Europe cautiously optimistic ahead of UK vote By: CNBC.com News June 22, 2016 at 00:53 AM EDT European stocks are expected to open higher on Wednesday, a day ahead of the U.K.'s referendum on European Union (EU) membership. Read More >> Related Stocks: Camden Natl Cp Europe 350 Ishares ETF Europe ETF FTSE Vanguard FTSE 100 Index France Ishares MSCI ETF Germany Ishares MSCI ETF