UngeheuerLich
Legend
The bolded is already false. All sheets have to be changed to reflect 1st level feats.
No, it is not. The characters can be played as they are. They are not completely correct, but still work.
For a bard, it makes no difference if they use their ability as a bonus action or a reaction. Both work within the same rule system.
You could just interpret the new classes as PHB 2 classes: it is not the bard, but the troubardor and it happens to have similar abilities that work a little different and all the classes of PHB 2 happen to have an extra feat at level 1 (not unlike the fighter level 6 feat).