Just ran through my stored tickets to see if they still change post-update, with the following results:
1 - 4* - 3/3 - PART Rampage TitRods -> GR Corolla TitRods
2 - 3* - 4/3 - PART Atenza SportSus -> Mazda3 SemiR Silence
3 - 4* - 5/3 - CRED 30k -> SAME
4 - 4* - 7/3 - CRED 10k -> SAME
5 - 4* - 9/3 - PART McLaren 650S SportSus -> SAME
6 - 3* - 12/3 - CRED 5k -> SAME
7 - 4* - 14/3 - CAR Toyota Tundra -> Amuse 380RS
8 - 4* - 20/3 - PART ClioRS'15 SCam -> SAME
9 - 3* - 26/3 - CRED 5k -> SAME
10 - 4* - 27/3 - CRED 30k -> SAME
11 - 4* - 30/3 - CRED 30k -> SAME
12 - 6*P - 1/3 - PART Honda CTR FK2 TitRods -> GT-R NISMO TitRods
13 - 6*P - 8/3 - PART 911 992 CarbShaft -> RX-7 FD CarbShaft
14 - 6*C - 15/3 - CAR Valkyrie -> Peugeot VGT
Seems to still be the case that credit rewards do not change (at least the low ones! I keep the high ones), while car and parts (and engines; I didn't have an engine on this one but I did on the last) may change - both cars and two from six parts changed.
Haven't had an invite in a while to check those. I've also restored the tickets for 20th-30th March on the basis of of a potential March 22nd/29th update, but I'm expecting the one that expires on the 20th will be too early and as the other three are credit rewards they won't change either way.
Edit: As I wasted these stats on a returning banned skidmark earlier, I may as well repost them here:
Roulette Ticket "Odds":
3-Star - 80% Credits (40% 5,000, 35% 10,000, 4% 100,000, 1% 500,000), 10% car, 10% part
4 Star - 53% Credits (28% 10,000, 20% 30,000, 4% 500,000, 1% 1,000,000), 20% part (10% regular, 10% special), 14% car, 10% invitation, 3% engine
My outcomes:
3-Star - 66% Credits (66% 5,000), 33% part
4-Star Excluding kept-ticket - 50% Credits (12% 10,000, 38% 30,000), 38% part (12% regular, 25% special), 12% car
4-Star Including kept-ticket - 55% Credits (11% 10,000, 33% 30,000, 11% 500,000), 33% part (11% regular, 22% special), 11% car
Not far off considering it was just single-digits of each.