Yes. All of the new cars will have full dress up. Furthermore, cars that previously didn't have dress up like the GT86, BRZ, 190E, SLS, and others will all recieve full dress up...Except the R35.

Currently no. But may be introduced in a future patch.

This is probably the single biggest change in WMMT5DX. The new dress up system is perhaps the biggest change since the implementation of customisable dressup itself in WMMT3. Below is a full explanation of all the changes.

Maxi G:

Maxi G (Gold) is the new currency earned by playing online ghost battle.

Shop Grades:

Shop grades replace the dress up level bar from WMMT5. There are currently 55 dress up levels as of patch 2.10. If you are at max dress up level 105 on your car on transfer, you will start at shop grade 35, from shop grade 35 onwards are all new dress up parts.