Regardless of whether we're able to pick any car below 20k credits or if we're forced to pick between the three Japanese compacts, I still plan to get the Aqua. I plan to at least use it in the Sunday Cup and the Japanese FF Challenge 450. Then, I think for my second car, I'll get a Subaru BRZ '15 for the Japanese FR Challenge 450. Do we know what other events there'll likely be? Oh, who am I kidding, I may as well wait these last three weeks out before launch - and then find out for myself!
(I mean, I saw the championships, such as a Trial Mountain Cup, and both a French Hot Hatch event and a Euro Hot Hatch event, but I believe those latter two were from a potentially earlier build.)
EDIT: Not to mention the next cars I get other than the Aqua could easily depend on what cars become available in the UCD as I play, or what cars I can win from the license tests - and that's assuming we can even do every license test early-on! Man, I genuinely love how hard it is right now to plan anything out.
EDIT2: OK, so I'm examining the State of Play presentation from earlier this month, and here are the events I spotted. Keep in mind that the player had a collector level of 19, so this is arguably the antithesis of anything resembling complete list.
Europe
Goodwood- Sunday Cup Classic - PP No Limit
Nurburgring - European FR Challenge 550 - PP No Limit
Nurburgring - Porsche Cup
Asia/Oceania
Autopolis - Japanese Clubman Cup 550 - PP No Limit
Suzuka - Japanese FF Challenge 450 - PP No Limit
Fuji Speedway - Japanese Clubman Cup 550 - PP No Limit
Tokyo Expressway - Japanese FR Challenge 450 - PP No Limit
Tokyo Expressway - Japanese Clubman Cup 550 - PP No Limit
Tsukuba Circuit - Japanese FF Challenge 450 - PP No Limit
Tsukuba Circuit - Japanese FR Challenge 450 - PP No Limit
High Speed Ring - Japanese FF Challenge 450 - PP No Limit
High Speed Ring - Japanese FR Challenge 450 - PP No Limit
Americas
Blue Moon Bay Speedway - American FR Challenge 550 - PP No Limit
Blue Moon Bay Speedway - American Sunday Cup 600 - PP No Limit
Trial Mountain - Japanese 4WD Challenge 600 - PP No Limit
Northern Isle Speedway - Sunday Cup - PP No Limit
And then here are the championships I found:
High Speed Ring Track Day
Tokyo Highway Parade Race
Petit Course de France
Trial Mountain Cup
Asia-Oceania Championship
European Championship
I bet that while there's no enforced PP limit on the events I've found so far, you might get a bonus for using a car with lower PP than the three-digit number that's alongside most of these event names, not unlike how in GT Sport's GT League, there was a recommended N-Series class for most events. If the car you drove was in an N-Series below the recommendation, you obtained a bonus, with the bonus having the potential to be even higher if your car was in an N-Class even further below the recommendation.
EDIT3: I also saw the Nissan Skyline GT-R GT500 among a bunch of Gr.3 cars, so I think this will mean both GT500 cars from the JGTC era will be in Gr.3. In another section of the video, the Supra GT500 is confirmed for Gr.3.
EDIT4: In the GT Cafe, there seems to be the presence of a certain "Tom Matano." Apparently, he's one of the car designers that'll be joining us, and notably did work for Mazda, with at least one iteration of the Roadster and RX-7 to his name.
EDIT5: The Pagani Zonda R will be the car you'll be tasked with for the High Speed Ring circuit experience, so this could mean that we won't be purely tasked with Gr.3/Gr.4 cars for the Circuit Experience events like we were in GT Sport.