I think it will be really neat and work really well if all classes have parallel progressions in everything. In 3e the 1st level fighter's BAB is only 1 point above the wizard's - wtf?
Here I will argue that that progression can be achieved simply by improving the stat modifiers.
Given the various news, I expect all of the following to have parallel progressions for all clases:
- skills (+1 per 2 levels is almost certain, isn't it?)
- attacks (seperate offsets for melee/ranged/magic sound good)
- defenses (if they scale like attacks, the scaling really only differentiates between high and low-level characters and the foes they are able to face)
- hitpoints (even though it doesn't have to be done that way, let's assume that the # of hitpoints gained at each level is modified by constitution)
- damage maybe (the question is if the wizard should get the same damage bonus as the fighter? Sounds strange but it may not be so bad after all if the fighter gets more attacks)
...obviously I also expect the different classes to have one-off modifiers to these stats, but that's not really what I want to talk about.
First, I see no reason why all of these (well, except htpoints they're different) should not increase at the same rate, say +1 per 2 levels. It will give relatively big 'bumps' at even levels, but that could be smoothed out by hav ing stats 'virtually' increase by +1 every level instead. If a flatter powercurve is desired, the rate could simply be changed to +1 per 3 levels.
Actually, what if stat modifiers improved by +1 per 2 levels for all purposes and not just skills? This would include attacks, defenses, damage, everything. Assuming that any check will be modified by exactly one stat and that the same is true for the opposing DC, this would keep the difficulty of same-level checks constant. I think that would be brilliant!
No need for BAB or save progressions anymore!
However, that would not work so well for hitpoints (assuming that the modifier is applied every level) since the deterministic part would be of the order level^2 and eventually make the differences between classes insignificant. If on the other hand, constitution only affected the hitpoints gained at level 1, there would be no problem.
My pet theory for hitpoints: Everyone rolls d6s for hitpoints. At each level, wizards add +0, fighters add +4 or something like that. Then I hope constitution is only considered at level 1, but it will probably be applied at each level.
While I think it would be really neat if the modifiers for *everything* increased at the same rate, I have an uneasy feeling that we will get one rule saying that skills are modified by +level/2 and a different rule/tabel saying that saves improve by +1 per 2 levels, and maybe another one for attacks.