Samsung revealed a new version of their Galaxy S5 phone. It's called the Galaxy S5 Plus, and it is basically the same thing as the Galaxy S5 4G+ which was launched in Singapore. It is basically an enhanced refresh of the Galaxy S5, but this one is for European markets, and that's also why it has a different name. The only difference is that it includes the newer Qualcomm Snapdragon 805 processor, which not only boosts performance over the 801, it also allows for slightly improved 4G speeds.
Keep in mind, this is not the same thing as the Galaxy S5 LTE-A which was only released in Korea. It seems odd that Sammy would launch this device only a few months ahead of the Galaxy S6 launch which is expected in February, but you can't blame them for trying to stay fresh throughout the year.
Source: Samsung