Popping up on Indian site Zauba, the handset goes by the moniker Samsung GT-I9405, and it's apparently touched down in India "for testing and evaluation."
Other than the 5.5-inch screen size, the leak gives very little away about the handset, but considering its ID doesn't fall in line with either of Samsung's flagships products (the Galaxy S4 is the I9500) it's not going to be the Galaxy S5 or a direct relation to the Note 3 (N9000).
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Samsung likes to launch a phone for every single segment of the market, so the GT-I9405 could well be a handset engineered to plug a hole in a specific market, rather than try to dominate globally.
TechRadar will be out in full force at MWC 2014, and we'll be reporting live on all the new phones and tablets, including anything from the Samsung booth.