Three or four this summer, then in fall, few more in winter, and finally four more in Spring. They will be part of the DLCs "Close Quarters", "Armoured Kill", "Aftermath" and "Endgame".
22 maps in the new version Battlefield 3 Premium.
There are a total of 20 new maps in the 5 Battlefield Premium DLC's. Along with those, there are about 20 new weapons, over 10 new vehicles, 4 new game modes, 30 new assignments, and 20 dog tags.
Whenever they make them, I'd guess early 2012.
3
Battlefield 3 Premium includes everything that the regular edition comes with and some expansions. The expansions are Back to Karkand, Close Quarters, Armored Kill, Aftermath, and End Game. These expansions include weapons, assignments, maps, dog tags, etc. This was copied from my previous answer to the same answer for a similar question.
From what I found there are 20 maps that come with Battlefield 3 Premium. I am not completely sure if the default maps are included in those 20 though. They might have more than from when I last checked though.
Battlefield 3: Limited Edition (and players with Premium) grants the player access to the "Back to Karkand" expansion. This expansion adds four new maps (among other additions) named: Gulf of Oman, Strike at Karkand, Wake Island and Sharqi Peninsula.
Yes you can drive a tractor on Battlefield 3, but only certain maps have tractors on them. Wake Island and Back to Karkand both have tractors I think.
EA and DICE just released a new map pack called Close Quarters. There are several small maps that would work well for two player.
Battlefield 3 can be abbreviated as BF3.
There is a dog in the campaign. I don't know about any other maps though
Yes, Battlefield 3 will have transportation just like Battlefield Bad Company 2 but will feature several new vehicles.