I hope we get to see some lap times, but I kinda doubt it. We never saw anything with the Agera R. However, maybe with their plans to bring the cars to several race tracks to GPS map them to make the cars go round faster, we'll see some lap times from various circuits.
As for top speed, its going to be difficult for them to find somewhere to do it. First they have to find a perfectly flat, at least 5mi long stretch of road with no potholes and such. Then get that stretch of road closed. Then do a run in each direction with the speed measured over a flying kilometer. And then pay for Guinesss to be there if they want to be in the record books. And since Guiness only recognizes a car as a production car if over 30 are built, the One:1 doesn't qualify anyway. But who cares about Guiness, I just want to see this thing to fast.
Well like I said, top speed really doesn't matter, and since there's only a few places in the world to do it anyway it's kind of pointless. But it does answer the eternal gearhead question, "What'll she do?"
As far as Guinness is concerned, I'm not even sure about that 30 car thing, I never even heard of it before the whole Venom GT thing. I think it's just an internet rumor. If it were remotely true then the Ultimate Aero should have never held the record, nor the CCR for that matter. They also awarded the "Fastest accelerating production
(my emphasis) car" to the Venom GT, a car built by purchasing a previously titled
Lotus Exige as Step One. So screw them and their silly book, there's a lot of other ways to validate a top speed claim (hello FIA), just make sure you do it in two directions.
What might be more intriguing, as you say, would be some serious attacks on the lap records at various circuits. If the active aero and all the other nerdy bits (meant as a compliment!) work as advertised, we could see some unprecedented road car times. I believe there's a 13-mile loop somewhere in Germany that many like to use as a benchmark.
The Top Gear track, I'm not so sure, most of the corners are awfully slow, negating much aero advantage. Unless they could get the guys at Pagani to loan them some tires.