The Galaxy A7 is expected to launch with a 5.5-inch display, making it the biggest of the suggested trio (plus the 4.5-inch Galaxy A3 and 5-inch Galaxy A5). A7's screen resolution will sit at 1080 x 1920, and a density of 401 pixels per inch.
What's more, we've also got another confirmation -- the 1.5GHz chipset powering the A7 is based on ARMv8-A architecture, meaning that we're looking at a 64-bit processor (Snapdragon 410).
From what we know so far, the entire A family will hit the market with Android 4.4 KitKat in tow, so the 64-bit part will stay irrelevant for a while.
Lastly, rumors have so far suggested that the Samsung Galaxy A7 won't be particularly cheap, and will sport a mid-range price of anywhere between $450 and $500.