Battlebots was always held in San Francisco, where the company had their arena set up. They held a one-off event at the same place 4 or 5 years ago so its likely to be at the same venue unless the 'major network' wants to pay for an expensive new set (which I doubt).

The time frame is the real issue - builders have to submit CAD plans to be accepted so if details are announced this month, you would have to work crazy fast on a design and probably not know if you are accepted until late February. Builders will probably have only 3 to 4 months to complete a heavyweight bot.