The basic kit of parts sure looks pretty common to me with item D being the only mystery.
From the website(s);
2015 Kickoff Kits will consist of the following items for all teams (sizes and weights are approximate):
A) Tote: With all of donated items that we usually get like CIM's, wire, battery ends, heat shrink, two sided tape and so on.
B) Battery
C) Best guess this is the new roboRIO control system. (September FRC blog post)
D) The Mystery box of one set of items, collectively 3 in. x 3 in. x60 in., 6 lbs.
Just about anything but a good guess would be something game specific like game piece(s) or a tow trailer kit, may be a banner or table cloth. We will have to wait and see. The bag and tag items
2015 Kickoff Kits will include the following additional items for Rookie teams only:
E) Tote: with Battery Charger, Classmate Netbook, one Joystick, one Gamepad, USB Key to Image Classmate, Set of assorted pneumatic components (compressor, air tanks, fittings, tubing, valves, PTFE tape, pressure switch, gauge, and regulator)
F) Battery
Teams who did not opt out of the Drive Base Kit will also receive the following item:
G) AMU drive base