The Big Agnes Seedhouse SL2 Tent has three listed weights. The packed weight of 2 pounds 10 ounces includes poles, fly, tent body, stakes, guy lines, stuff sacks, instructions, and packaging. Basically the weight it's delivered from the shipper. The trail weight of 2 pounds 2 ounces refers to the poles, fly, and tent. The fast fly weight of 1 pound 11 ounces refers to the poles, tent fly, and accessory Fast Fly footprint.
Thanks for your question. It is the most current (2016) model year.
It should be slightly smaller, but not substantially smaller. If water is able to get on top of the footprint it will puddle in between the footprint and the tent floor. Although tent floors are waterproof, if there is any sort of abrasion then the water can leak up into the tent. The footprint is made smaller than the floor to prevent this from happening.
When a newer model of a tent comes out there can be minor modifications in the weight. Usually weight savings come from lighter material or poles (usually using newer technology to achieve the same strength with less weight).
Currently the footprint is offered as a free item with the tent. You can view it here: http://www.campsaver.com/seedhouse-2-superlight-footprint