The economy has been rebalanced. With the increased number of races in the game and more Chmpionships being added in place of Single Race events, there will be more money to go around, but the early game will be tighter on Credits than the vanilla game. Prize cars are all useful now, and I made it so the game can be finished without ever having to buy a car, so you'll also need less money to progress.
The login bonuses have been removed, as they are no longer necessary, they were just a bandaid fix for the poor XP system and served as incentive to play online, but everything has been restructured now and designed without them in mind.
GT5 Evolution is based on the Master Mod, everything that it supports will continue to be supported.
It is currently focused on A-Spec, but a future B-Spec update is planned, I'm just not sure to which extent I can modify it, as certain changes made in A-Spec (such as tightening event regulations, the lower number of laps on each race, tougher AI) may make the B-Spec races extremely difficult, since B-Spec drivers start off with poor skills. I'd like to avoid having to repeat the Sunday Cup 10 times until your driver finally wins it, for example. All of this will take some time to get right, which is why I'm waiting until I'm finished with the A-Spec side of things to release the mod and then do B-Spec for a later update.