According to the recently released stats for the beta, 8,125,310 million players logged on to the various networks to play Battlefield 3. Alongside that impressive figure, as you can see in the image above (full size below), DICE was keeping track of all kinds of stats with that new fangled Battlelog.
The beta which lasted for only a few weeks saw players taking to the Operation Metro multiplayer map on consoles, while PC gamers got to experience some vehicle carnage on the Caspian Border map, but in that time 1.5 Billion kills were registered. DICE recently revealed the nine full maps for the final version of Battlefield 3 in two parts Part 1, Part 2 and a Multiplayer Trailer
Source: Battlefield 3 Blog