If base pay is raised at your store, then base pay for all pay grades is effectively raised. All higher pay grades are based off the N03 pay grade. So say that $8 was the N03 base at your store. If your N03 base goes up to $9, every other pay grade should jump a dollar as well (assuming the pay grade differences stay the same). You will only see a raise if you are making less than the new base for your pay grade, in which case you'll be bumped up to the new starting pay grade base.
So let's say you're a perishables assistant, N09, and the N09 base pay is N03 base pay + $1. Let the N03 base pay in this store be $8.25, which makes N09 base pay $9.25. If N03 gets bumped to $9, then the N09 should be bumped up $10. If you are currently making $10 or more per hour you will see no change. If you are currently making less than $10 an hour, you will see a bump up to $10. Any other new PAs will also be hired on at $10.
But merit raises added to your new base will be nice, although they may not amount to much of a difference. Considering that the old regime would've given everyone merit raises and then bumped up base pay a couple months later effectively nullifying a large percentage of merit raises... This at least seems like a step in the right direction for the new leadership to establish a different, healthier culture.