I think the new way of wording the ability mod + skill bonus must have something to do with that +7 cap. It's not clear whether this applies as a +7 cap to how much you can increase the original +3 for having the skill, or the combined skill and ability mod.
However, combining them and then specifying the cap would seem to indicate that the +7 applies to the total. If so, that's a rather interesting slant, as it means that the +1 skill adjustments is primarily for skills where your ability mod isn't all that great, as it will readily get capped in other cases.
Of course, given how few and far between such skill adjustments seem to be, that might not be much of a restriction. Yet, it does mean that a character that reaches even an 18 in an ability mod is advised to leave the base skill alone, once achieved.